So, FI and I are going to a wedding tomorrow night and a former friend of FI's will be there. They hate each others' guts-seriously. I have never met the guy but FI warns me that this dude will be a complete ahole to my face and will straight up tell me I am fat (I'm not overweight-5'8 140 pounds and I like my body) and try to break my spirit ( what a standup guy, huh?) Anyways-It is in my nature to be a total bitch right back and make similar snide remarks back at him but FI says this will only make things worse and will cause Mr. Douchebag to cause a scene. The last thing I want to happen is to detract from the couple's big day but I also think it is demeaning to let this guy completely bully me. We are sitting together for dinner due to assigned seating otherwise we would just avoid this d-bag.
FI would totally stand up for me if he thought it would help but he thinks it will only make things worse which I understand. What would you do in this situation?