I'm not going to pretend to understand your stuggle, but I will echo it through my lens. I am not trying to hijack your point, inasmuch support it with my view.

I uses to think that it was about fear of the unknown, or as you've said "Being angry at people who make you feel a bit weird inside".

I now firmly believe that it's a modern form of tribalism. Having an "other", whether as a scapegoat, a fear inducing device, or a target is simply too convenient to ignore. Whether or not one is a globalist is orthogonal to the fact that people ultimately decide, or evolve to see through a different lens.