Unfortunately, there's a lot of truths to your comment. I straddle the line of race for being mixed (with 0% white in me) but I do notice Asians and Latinos have hugely internalized white supremacy. POC is simply an identity adopted when necessary/advantageous and as you said, they'll shy away from it when they get what they want.
But when speaking about sex, I can only speak to my lived experience though; non-white tops engage in exclusion of their fellow non-white bottoms. Not necessarily complete exclusion but if given the choice, they will choose white bottoms over their own kind. Sure, many non-white bottoms do this too, in fact, it's literally a trope now and even exist in bb community in the form of raceplay. It's definitely problematic, I will not argue that. But the core of my post is to highlight the former (which isn't talked about as much) which also feeds into the non existent 'bottoms of color' despite there being lots of us in the community, whether that be a Black, Asian, Latino, any POC bottoms.
Judging from the responses here, it also seems that people are quick to chime in about how they don't care about the dick or the person --> which is all fine, good for you to not see colors but look at the post again, this is about BOTTOMS of color. I think I've already established in my post that TOPS of color are well celebrated, either via fetishization or other manners. On the other hand, BOTTOMS of color are almost unheard of, it feels like the bottom role is primarily reserved for white men.