If you want to talk about making some other comment on someone's provided identity, well, I'm still going to advise you not to do that. It's just not your business. There's very few contexts where it's going to be appreciated. What are these comments that you feel you must share?

> Further the "no business in" applies to someone's (self identified) race.

Lacking a shared identity and commenting on that identity does lessen your social pretext to comment on it. But no, it's not exclusively a race thing. It's moreso that it is their personal identity. It's not yours. And any unsolicited commentary on it is likely to be taken as adverse. It's not cool to tell someone how to be Black just because you're Black yourself. Or any other identity.

I'm saying, very plainly, that doing shit like this will make people think you're an asshole. And you're asking why can't you do it. And that's just not a valid question. You can do it. You ought not to. Why? Because it will make people think you're an asshole.

If you want to "foster a discussion" on an identity issue, that's different. But it begins with asking questions, or asking for feedback on ideas. Not with challenging their perceptions or asserting your own.