Why is everyone racist!?

You know Ben who I've talked a little bit about? If you haven't read my other posts he's my best friend boyfriend. Which makes him my friend, but not a good one. I already had a bad day, because I'm on my period, have exams and just been feeling ill in the last days.

 So I was singing call me baby by Exo, except I ofc do not know Korean. So I just sung nonsense in the Koreans line, meaning I sung nonsense and in-between sung call me baby. Anyways he heard me and asked what I was doing so I explained him that. So he started singing in a racist way saying Ching Chong and that stuff. This made me pissed because as an asian(wasian) I'm so tired of those jokes. So I told him I wanted to punch him at that moment and he just laughed and said it was a joke. Well not a good one, it's so overused anyways. But then I said to him you dont really know how it is, you're white. THEN he has the audacity to tell me I'm racist. Like wtf!? You do not experience racism like that, was all I meant and he knows that damn well. I was so pissed and already emotional because of the past days and being on my period. So I got tears in my eyes, it was a bit embarrassing, but I couldn't controlled it and it wasn't much. He saw I was pissed tho and laughed and my best friend who were there the whole time just said we should stop before we would make a big deal of it. 

My best friend knows how much I hate here boyfriend because he is so racist, but she just excuses his racism. It so annoying because why can't she defend me for once instead of ignoring it all. He has written the n-word in their chats and said so weird jokes, but she just laughs it off and changes subjects, which pisses me off.She says it's annoying, but never does anything. I will never understand her being with him, when he makes me feel so bad about myself. Especially because he is a bad boyfriend to her(not that she is better). Im just so tired of them and how every person around me seems to be racist. And im so tired from school I think everything makes me mad right now.