Why is it considered racist if a white man refuse to date a white girl who dated black men in the past?

Anonymous
I was dating a girl for 6 months, then I found out she was very vocal about preferring black guys in the past, it was a huge dealbreaker for me and I broke up with her. No regrets. My only regret is that I didn’t find out about this until after I checked her past activity on social media and wasted my time with her.

She is resented toward me and trying to salt my game with my latina new babe by spreading rumors that I’m racist and a white supremacist. I’m not. I just don’t like to be the second choice of any girl. Since then she says bad things about me everywhere, specially to my girlfriend’s sister and her family ignore me. They and many of our acquaintances think I’m a monster for doing that to my ex but I just did it for my own good, she was playing me. If she likes black men so much as she said in the past, so she has nothing to do with white men, if she said that but it’s not true, so she is a liar and don’t deserve to be trusted. Nothing can make me think its not white girls’ entitlement, why do they act like that? What should i do to save my rep with the family of my new girlfriend?
Why is it considered racist if a white man refuse to date a white girl who dated black men in the past?
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