When this woman is upset with her MIL, she asks Reddit:
My husband and I had a big fight last night because of how he was talking about the women his two boss's are married to. Basically he works at a firm owned by two business partners and their wives despise each other.
Everyone at the firm knows it, so they decided to do a prank at the company party and get them to unknowingly wear the same dress. Personally i didn't think it was funny as I don't like seeing women treated like that, but everyone thought it was hilarious.
I recently overheard my husband talking to a co-worker and the guy mentioned having a good picture of it. My husband made a joke about how he can send him that picture as they are both so beautiful it would be like having a piece of art. Needless to say I was beyond hurt. i had him sleep on the couch.