This study might explain a bit of it, but it goes well beyond expressing political views. I'm talking about when you're living in apartment and you have two neighbors on either side. The dumb neighbor invariably clanks his pans and dishes and plays his crap music loud while your smarter neighbor is quieter in all aspects. Or think about dumb guys and their need to make their cars and trucks and motorcycles louder. Or when you're at the movie theater and you're subjected to dummies talking loud. Or Philly fans versus the rest of humanity? Why is that? Why is there some correlation between higher intelligence and less clamorous behavior?
Link: https://nypost.com/2019/01/17/stupid-people-are-loud-and-proud-study/