Xenophobia is an intense, irrational, pathological dislike or fear, and connotes something pathological. Bias (in this case, tribalism bias) is something that's

Xenophobia is an intense, irrational, pathological dislike or fear, and connotes something pathological. Bias (in this case, tribalism bias) is something that's a pretty well ingrained aspect of human psychology, and something everyone has. While a common usage of bias has the connotation of something unfair, it's also used in a stricter sense to indicate these inborn aspects of the human psyche. My original comment was intended to point out this distinction. I should have taken the time to be clearer. As for racism, sexism, and so on, or the political aspects of these, or xenophobia, those are beyond what I was addressing in my first comment, and not a mess I'm interested in digging into right now.