Because I'm asked to explain my preferences? That's nobody's business.

What is and isn't anyone else's business is ultimately arbitrary, but you could say you'd rather not explain your preferences to her because you don't believe they're anyone else's business instead of erroneously associating her with a subreddit that has repeatedly falsely accused her of being racist.

And you don't think I get brigaded by them either? They called me into their sick subreddit and made an entire thread dedicated towards psychoanalyzing me. It's sick

I don't disagree the vast majority of those users are mentally disturbed, but you also went out of your way to make scientifically unproven generalizations about a racially-defined demographic in a public forum. If I posted about how I believed black men were, on average, less intelligent than non-black men on a forum surrounding black women's issues, I'd expect a lot of backlash, too. (Note: this is a deliberately provocative and racist example; I do NOT believe black men are any less intelligent than non-black men.)