Sorry I have to disagree. I don’t play often enough with brazilians to say something on the matter, but for european servers the vast majority of toxicity I encountered came from 2 groups:
Russians & French.
I never see italians spam the global chat with their native language, I don’t see germans, norwegians, swedish, danes, spanish etc.
It toxicity was average across all countries you would also get the feeling that “everyone” does it, but I don’t have that feeling nor do others have that feeling.
The hate that goes towards these two groups is obviously unfair but not unfounded. After thousands of foreign lines from these groups it is no wonder that pushing back can be noticed.
The only solution to these kind of problems is never short term. It takes as much time to heal a rift as it takes to open it.