This is a strange one because in a way Im really happy for you, great for your boss to stand up for you. But at the same time I kind of feel bad for the BM.
Now that depends on her intentions, if she and the husband came in to cause bother then good on the boss for stopping that one. But heck, if she and the hubby came in to an eating establishment with the intention to have something to eat and drink then damn, it is awful to be essentially barred from a place when youve not done anything.

This is a definite Catch 22 situation. As a former restaurant/bar owner and entrepreneur my choice would have been a bit different than the choice your boss made. I would not 86 customers because of personal issues one of my staff may have with them. I would expect my staff to be professional and adult enough to deal with the situation in the most professional way that is best for the business.

I would of course not force the involved staff member to wait on those people but 86ing them from my business would not happen unless those customers forced that hand by their behavior while on the premises of my business.

That said, I had an interesting and related experience at my wedding reception when XW and I married. I met XW when I bought the business and she was working there. Two years later we married and the entire staff was invited to the reception except those that were working that shift. My XW's cousin's husband was an undercover Narcotics officer with the local PD. Unbeknownst to me two of my bar staff were under investigation for dealing cocaine. The cousin's husband attempted to eject those two members of my staff from the reception. I had to lead him aside and inform him that he could either STFU, stay, and enjoy the reception or GTFO. I informed him that if he called me and set up an appointment when I got back from the honeymoon that I would be happy to work with him regarding the alleged drug dealing bar staff. He was pissed that I bucked his perceived authority and my XW and her mom were livid that I embarrassed their family member. Not my F-in problem. There is an appropriate time for everything and work is not the appropriate time to deal with personal relationship issues and a wedding reception is not the time to deal with alleged criminal activity not occurring at the reception.

He did call me when we got back from the honeymoon and I did cooperate in the investigation of my two employees. Ultimately that investigation came to nothing as the two guys were casual users at most and were not dealers though they did have some notable dealer contacts of their own that they had no problem forwarding interested customers to. The cousin/undercover narcotics officer eventually pressured my guys into helping him nail their sources. I advised them to cooperate which they did. Those guys remained working for me as my business was restaurant and bar operations and not drug dealing. They were great employees. They both recognized and commented on how I had dealt with the Narcotics officer at my wedding reception and appreciated that I had kept them and their wives from being booted from the reception and embarrassed.

Also in a related incident I had a family that ultimately became very regular customers who presented a problem their first visit to my restaurant. They came in late one evening a couple of hours before closing and ordered dinner. The wife wanted a specific dish that we did not have available. What she ordered was Gyro with no lamb, only beef. Our Gyro was a ground meat mixture of 60% beef and 40% lamb with proprietary seasonings. She gave the server a ration of shit over refusing to make what she ordered. I stepped in and re-explained to the customer what the server had told her and that what she ordered was not possible and that the server had explained to her why and had suggested an option of a beef item we offered that we would season with the proprietary spice blend. When it arrived at the table she went ballistic. "If I wanted a burger I would have gone to Wendy's" .... rant....rant....rant.

I attempted to calm the lady who just kept escalating her ranting boil and even started ranting that the server had been rude to her, etc... I informed the lady that her server was extremely professional and that I had observed and listened to the entire intercourse and also informed the lady that her server had a Master's Degree in psychology and very well knew how to deal with people. She kept ranting until eventually I turned to her husband and said "Sir, you and the young man are welcome to stay but I am going to have to remove the lady from the premises if she does not immediately calm down and quit disturbing my other guests." The whole time the man and the son had been hunched over eating while the lady boiled over. Without missing a bite the man reached up, grabbed the back of the ladies collar, pulled her down into her seat, and said "Sit down, shut up, and eat your meal." She collapsed into tears in the chair and eventually ate and even enjoyed her meal. A few days later the lady brought a group of her friends in for lunch, coffee, and drinks. She gave the server she had ranted on a card with a notable tip inside and pulled me aside to apologize for her behavior and to thank me for dealing with the situation with professionalism and understanding. She and her girl posse and her family became very regular long term customers.

It is a very good thing that your boss is supportive of you but business is business and personal drama has no place at the place of business. Next time BM and her DH come in try having them seated in the station of another very strong and professional server and help make their experience a good one. Your boss will no doubt appreciate and recognize your professionalism and the priority you are making of his business.

IMHO of course.

You should not be proud of yourself for acting like an immature, petulant mean girl.

Seriously? This is the NEW YOU you are so proud of? Are you 12????

Simply pulling your boss aside and asking if they could be seated in another section would be more than enough to prevent any hardship to either party.

Your boss doesn't sound very professional, nor mature. He won't be in business long if he mistreats people to impress a waitress.

BM knew it was her place of business and was trying to create a problem. Boss handled it fine.

No different than if I started grocery shopping at the store that BM is head pharmacist at. I avoid it and if I have to run in there because of something, I am in and out. I may hate the woman and would love to embarrass her, but it is where she works.

I have been in your situation before. Only it was XH. I was a bartender and he would come in to taunt me. The second time this happened he was banned by my manager.

Considering that in my life, the night my DH proposed to me at our favorite restaurant, when we went to leave, BM and skids were waiting to be seated and she decided to go ballistic screaming and ranting at the top of her lungs and generally causing a huge scene in front of a crowd of strangers, over nothing...........

I can understand why you didn't want anything to do with your BM. I think it is noble that your boss decided to head a potential issue off at the pass.