How can I reject a guy without sounding racist?

Anonymous

My problem is English is not my first language, I am from Europe and since I have settled in USA, some of the black guys around me is trying to flirt with me or simply asking me out but my type is white guys and whenever I reject them, they say I am racist or get aggressive and blah blah. I don't know if it's with my language bc I just say ‘thank you but I don't want it, I really am sorry.’ That's what I am saying I'm not sure if it sounds awkward in English speaking countries but it's a polite way of rejecting in my country. So how can I reject them without sounding racist and I also want to know why they approach me more when there are more more beautiful American girls than me, around me?

How can I reject a guy without sounding racist?
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