Should He Break Up With His Girlfriend Over a ‘Sexist’ Tradition at a Restaurant in France?

Feminism ruins another relationship:

AITA for not taking my girlfriend’s side over a sexist tradition at a restaurant?

I (M26) am a second generation French immigrant to the US. I speak French and most of my family lives in France, so I try to make a trip back to France once or twice a year.

I have been dating an American girl (F24) for two years now. My girlfriend does not speak French at all. The actual events in question happened this winter.