Here. Adams writes in part:
The left has done a stellar job of demonizing Trump supporters and Republicans in general. Their excellent persuasion involves conflating the bad apples with the entire group. Both sides do it. The right calls everyone on the left selfish snowflakes, and the left calls everyone on the right racists. They do it because it works. The brain likes to conflate things. And if the shiniest object in our view involves headlines about racists, or lefty rioters, those images stick in our minds and taint our impressions of the entire group.
So let’s try this thought experiment.
Read the rest. Adams does discuss the fact that he himself is generalizing... but not in a way that will be to everyone's satisfaction.