When a person of color, especially if they're black like me, affirms their support for causes such as queer liberation, feminism, animal rights, or socialism, I immediately feel that I can believe, with minimal doubt, that they're truly convicted and principled in what they're advocating for.
However, when a white person claims to support leftism, until my skepticism is proven wrong, I immediately assume they're a dishonest and performative libshit. I then proceed to interact with them with hefty amounts of caution. If my assumptions are proven true, I'm never shocked.
I'm sorry this happened to you growing up. I think that experiemce did give you an understanding of racism in that, you were taught younger than most white kids that there are races in this country and that has a meaning. That said, many white people told me similar stories of being bullied by the Black kids at an all Black school(some use it as ammo that reversed racism exist). I believe for a lot of white kids it's the first, and possible only, time they're explicitly racialized, but it's regular school bullying for being noticeably different hence the context doesn't leave the school setting.
I wish I could do unspeakable things to my bullies. Those assholes messed me up for life and I believe contributed to some health issues I struggle with to this day.
Yeah I was bullied too because my features make me stick out. Terrible time, kids are terible. Hope you get revenge or peace, whichever comes first.