That's actually one of the best things about online communications. I may talk with you for years before I realize you are a member of $RACE and $NATIONALITY or that you live in $COUNTRY. We get the opportunity to build relationships without all that garbage in the way.
@lnxw48a1 I don't think OP means to extract people's race from their avatars; rather, it's probably the topics that differentiate audiences, and how relatable they are
@Gargron Well, for example, I'm a US-based Black male. People know this because I talk about it, but there are only a few topics where it makes a difference. For the most part, people whom I've communicated with for about a decade are still popping up to tell me they are surprised to discover my ancestry.
Perhaps the OP meant that people in timeline are not discussing topics that person finds interesting. But in that case, asking for pointers to people who share those interests might give better results than "Find me members of any group except White, so I can subscribe."
My sons have White mothers, so "too White" has come up in a few intra-family interactions, as has "too Mexican" for some of their cousins. One brother's ex-laws used to say his kids were "too Black" ...
An even funnier concept of the web is that people can tell you anything they want about themselves. So there is nothing to care about the physical aspect of someone that is discussing with you. Already told this some time ago. The only true border that's exist on the web is the language, a second border can exists but that's a choice.