What does your MIL/mother do to really irritate you that probably shouldn't.
I can't stand the language my MIL uses to talk about DD. She says that she "regurgitated" and that she "expelled gas" and had a "bowel movement" so she had to "change her pants." Who the hell are you? Pretentious. blah. This probably wouldn't irritate anyone else, but it bothers the hell out of me.