I (25M) and my girlfriend Min-ji (25F) are in the same masters program. Min-ji is half-Korean, half-German, but she's lived in America her whole life.
One day, we were on-campus studying together, when Min-ji picked up a call from her mother. She spent the phone call speaking entirely in Korean. When I hung up, I said to her "you speak really good Korean for somebody who's never visited that country before". She just got a bit flustered, and told me that she has actually visited twice before, and she speaks plenty of Korean with her mother at home. I then mentioned to her that I wouldn't have guessed that she was fluent in Korean, considering the fact that Min-ji looks more white than asian. I could tell that this comment really pissed her off, which is out-of-character for her because she's usually really mellow and laid-back. She went on this semi-long rant about how sometimes she gets so confused about her own identity, as a mixed-race person. After she finished her rant, I half-jokingly asked her "so..............what are you?" I know it sounds awful, but Min-ji has a very dark sense of humor, and what I said goes in line with what she usually finds funny. But all she did was stammer and make a few angry noises before getting up and walking away. She did come back after a while, though, but she did make me watch her stuff.
Is this just a typical case of my generation getting easily offended? Or am I the asshole?