AITA for speaking Italian to my girlfriend’s rude Italian American family?

So I (M/26) recently started dating a girl (F/27) whose parents are Italian Americans (though they’ve never actually been to Italy). The mother is very rude and has been since day one, making demands, rude ‘jokes’, just being generally obnoxious. I was willing to put up with it for my girlfriend’s sake, but she was beginning to get fed up too.<br><br>The night the incident happened, we were all at some sort of family dinner. The mother kept making jokes about how I wasn’t good enough (she likes to mock my accent, I have a thick Southern accent), how I wasn’t making enough money, and a lot of other rude things. I had had enough, so I asked her in perfect, baroque Italian if she was done, and if so we could go. She was enraged - I don’t speak much Italian usually when I’m with her because she doesn’t speak it, but my mom is an Italian citizen and we lived there for several years when I was a kid.<br><br>She went off on how dare I talk to her like that and I wasn’t even Italian, I was nothing but some stupid redneck, etc etc. I snapped back in Italian and told her that her Americanized Italian was embarrassing, and I wasn’t some stupid little boy who would take her shit. The rest of the dinner was incredibly tense and my girlfriend and I left almost immediately after.<br><br>She hasn’t stopped yelling at me since. She says that I’m a complete asshole and I have no idea how offensive what I said was - she can’t believe I spoke to her mother like that, and I should just get over the insults because they’re not meant to hurt my feelings. She says that her mother was just joking, even though the jokes were at my expense and were meant to hurt. I told her this is it - the mother can either be polite to me, or I won’t see her again. My girlfriend told me I was being a rigid, immature asshole who couldn’t take a joke, and that if I couldn’t handle her mother I couldn’t handle her.<br><br>I think the mother is totally in the wrong, but maybe I did go too far. AITA?<br><br>Edit: I think there’s a bit of confusion about why I spoke in Italian. The reason I did it wasn’t only because I wanted to show off and make her angry - it was to show her that the ‘uneducated redneck’ she thought I was actually spoke her ancestor’s language, which is something she and her family take a great deal of pride in. When I said that her Italian was embarrassing, what I meant was that it wasn’t even real Italian - it was some faux-dialect her grandparents had made up based on what they’d heard from their parents and what they’d learned from the old country, which is now very out of date and basically a cartoonish parody of Italian. She has absolutely no idea what a real Italian from Southern Italy actually speaks like, and I wanted to illustrate to her that she was the one who was ignorant, not me.<br><br>As for the ‘jokes’, she was making fun of my teeth (they’re slightly crooked) and calling me over and over a ‘redneck hillbilly’ (I grew up in Florida, nowhere near the hills. It’s a very flat state). She would mock my accent and call me dumb, which is why I got fed up.<br><br>Edit2: I feel like there’s a lot of people in this thread who think you can just avoid your partner’s family forever - that’s not how it works. Eventually you’re part of the family, and you have to interact with them. If these interactions are always going to be hostile, it’s a problem.