you don't have the data and knowledge necessary to make decisions that affect this
What decisions are you making that are based on questions like "why do black people sit together at lunch?"
Look, I get it. Everyone wants to dive deep within someone else experiences ostensibly to be able to relate better or whatever. There is no shortage of these stories to be read in books, online or elsewhere. Where in my opinion it crosses the line is when it's in the work environment.
The only exception I can see for this is if your work revolves around deeply understanding or catering to a specific racial/other demographic that is not your own. That's problematic enough as it is, but in those cases it wouldn't be personal in the same way that these conversations seem to go.
The whole thing is voyeuristic.