Where tribalism is normal? That’s literally everywhere. Do you have a favorite sports team? I don’t. Do you have a religion that you think is right? Not me.
I’m a member of groups, of course, but I feel no urge that these groups are somehow better or more than others.
Now, is it genetic or learned? Who knows. I was just replying to the guy who said it was a gene. I guarantee no research shows that’s a thing.