Whitest black man... Update

So me and my girlfriend are both 19 and ttc. Her family is always telling me how I'm the whitest black man they know because I listen to music like Simple Plan, Panic! at the disco, My Chemical Romance. Also that I'm very sophisticated for a black men. These comments bother me and my girlfriend thinks they're funny and I've mentioned they bother me but she says I'm being overdramatic and they're just saying the truth. When I brought up my mom being a single mom they said "Oh dad left". I said no he died when I was 4 and his mom laughed and said "That's the first time I've ever heard a good reason for an African American man not being involved with his kids". Then everyone laughed. When they met my mom they were surprised by how "white" she was and say it makes sense I turned out the way I am. They constantly make jokes about me being the whitest black men and... Maybe I'm overreacting idk..

Update: I had a talk with my girlfriend (she is white, to clear up any confusion) and she said I shouldn't be offended and I should take it as a compliment that me and my mom aren't like most black people........