I see this and worse all the time since the majority of my matches consist of Mexican players with 70+ ping (despite me living on the east coast!)
I’d hate to generalize, but I really don’t see even close to the same lack of sportsmanship among my own region, the rare times of day that I actually match with them. I would absolutely LOVE to be able to region lock myself. Please add it to the Matchmaking options: “Restrict to my region” or similar. It sucks seeing your screenchat full of a language you don’t speak and makes it borderline impossible to coordinate with your team.
I know some people will say: “oh but then they won’t be able to find any matches!” and frankly… that should be their problem, not mine. Sorry 
