I hate how ignorance and racism are still rampant in America?

I hate how just because I am 1/4 black I am automatically not immune to racism. I mean some people hate me just because I am mixed and "destroying their white genes" it is so idiotic, I did absolutely nothing to offend them except be born partially black. I hate black people who feel I need to "prove my blackness and support" to them, I don't owe you anything just because I partially belong to your ethnic group. It pisses me off, I just wish that the people that say crap like that regardless of their race would get trapped in a cave and die off.