<human>: Can you summarize the given text in a few sentences?

Quick background: I'm a white girl, and he's filipino. We do sometimes bring up eachother's stereotypes for our own races, but we both realize how rediculous they are so we just laugh at them. Anyways...

So he's always been a little immature, and I'm fine with that because I can be pretty immature sometimes. However, lately he's been making me feel uncomfortable. It started a couple days ago when we were joking around, being our usual inappropriate selves. He jokingly said I must be a neo-nazi or something. I denied it and then dismissed what he said and moved onto another topic. Then yesterday he started joking about it again. At the time I didn't really think much of it and just told him blatantly that neither I nor my family have ever been apart of or affiliated with any nazi organization or the KKK. I started thinking about it again today, and now I'm just kinda mad that he even has that thought in his head. So now next time he brings it up, I wanna be able to say in a clear but considerate way that I am disgusted that he even has that image of me. I love the guy, and I'm not willing to end our relationship over this, but I do wanna make it clear that those statements make me uncomfortable. What's a good way to tell him that I don't want him to even joke about that?
<bot>: Boyfriend joked about how if I'm white I must be a neo-nazi. That makes me uncomfortable. What's the nicest way to tell him to stop saying that to me?