Any info I give here is solely based off my experience in the Valorant scene. I'm sure you will get several of this same, repetitive response, but what's most annoying is the complete overhyping of Brazilian teams, only for them to flop when tested internationally. Some 'superteam' like Vikings at the first LAN in Iceland get hyped up by Brazilians, only to be disappointing. Then the cycle repeats again. A new 'superteam' like Vivo Keyd is formed who are hyped even more to death. Only to get absolutely clapped again. The cycle repeats and the same story with Loud is happening once more.
Other things I feel that are catalysts to Brazilian disdain among the community on vlr.gg are their general lack of taking responsibility for anything. For example, when they used a known camera exploit for numerous rounds. Keyd, for some unfathomable reason, were allowed to replay the game while only starting off at a round disadvantage, despite previous tier 1 teams having been disqualified for using the exact same cypher cam. Rather than actually being happy about receiving such a light punishment compared to other teams, they started sending death threats about the outrageous injustice their teams were facing. (Yes I know there was a previous decision which would give the win automatically to Acend even though Keyd would still not be disqualified unlike the other teams, but I read numerous death threats with my own eyes regarding both the original and new decision for their punishment, despite both being pretty generous ones.) More examples of failing to accept/take responsibility include what I’ve mentioned earlier, Brazilian teams flopping hard internationally, only for the fans to be blindsided by the fact that they’re pretty terrible (no offense) as of now and continuing to hype the teams and players, demanding more slots as they have ‘good viewership and dedicated fan base.’ (I haven’t seen as many Brazilians say this but definitely too many have complained about their region needing more spots for LAN events because of the aforementioned reason.)
Another thing is that, Riot appears to be (at least it sure looks like it) trying their best to keep the Brazilians content (This seems to be more out of the control of Brazilian fans though.) Like they keep getting 2-3 spots for LAN events for some reason. 2 guaranteed spots in Reykjavik, 2 guaranteed spots in Masters Berlin, 3 spots in Champions, 2 of which were guaranteed and Furia having an easy breeze of a qualification through South America last chance in which 3 of the last 4 remaining teams were Brazilian with an extremely one sided final, even though regions like Korea have been more successful and have always had only one spot, and Japan who has had one spot as well, despite performing at a very similar level to Brazil and having more viewership and investment too. As mentioned before, their punishments have also been very lenient. This all seems to justifiably cause unsatisfactory feelings about slot distributions, with the hate being directed toward the Brazilian region.