I think it's just because we were eager to see Brazil prove itself as a region, because it's been really underestimated. People are just angry their efforts are kinda being in vain, but yeah this shit really blew out of proportion.
It literally makes no logical sense assuming Sen will easily beat Furia since last time they played they had 3 tight matches, one of wich Furia won. Maybe you're biased or smth, but there's literally no point in this assumption