You two sound like my brother. He doesn't like the guy, either, and he won't see the movie for that reason if none other. And he's like that about a lot of stuff...when I ask why he poo-poo's shows or movies with people he doesn't like, it's either because of how they look or they were in something else he didn't like or they're a bad person or whatever. It'd be one thing if it was just an occasional thing, but it's like half of everything is that way. And I don't get it.
See, I don't particularly care about the actors or any of the other staff as long as they play their part and put out good work. Celebrity is meaningless to me: generally speaking, I don't care what they do so long as it doesn't pertain to me or isn't some egregious failing. There are a few world-class turds out there I won't patronize by watching in a movie or TV show, but they're very few and far between. Hell, if I just went by what I thought of them personally based on political issues alone, I'd do multiple mag dumps in all my AV hardware and never go to a movie again. That doesn't even get into those who kick puppies or screw babies or don't recycle or whatever other reasons I might have to not like them.
In Chris Pratt's case I'd never heard of him before the first Guardians movie, and I haven't seen anything else he's been in, either. I just know I like the Guardians movies, and he hasn't detracted from them at all in my estimation.