My friend is pissing me off what the fuck

She’s always trying to prove how “Mexican” she is. It’s so annoying. I am white but I wasn’t raised with white people since my mother married a black man and I was not around my family from the age of 4+ because he thought it was inappropriate for me to have any family other than his. (I love all my cousins, nana’s and aunties from his side to death) Not that it matters but just for some context. I don’t tell people about that because I just don’t tell people about my life so she doesn’t even know that. Anyways shes always saying “Omg you’re so white” which I thought it was funny and goofy at first but now it’s with EVERYTHING and becoming annoying. If I do something nice she says “omg you’re so white”. I literally unwrapped a burrito out of the foil to eat it and she was like “oh my god I didn’t think you could get more white until now. Mexicans/black people do not take the foil off we just push it down. You’re So white it’s cute” it’s seriously so annoying. Does anyone else have friends that say dumb stuff like this? How do I tell her nicely to fucking stop or we’re not going to keep being friends. I hate it. Like so what if I’m white???