Yes it is an isolated case, at least here, I'm not gonna include Latin America. Nobody comes close to the insults Vinicious gets. Raphina doesn't, Rodrygo doesn't, Militao doesn't, or we can also talk about Dembele or Camavinga.
The problem is specifically with Vinicious and that it's for different reasons. Why I think this happens is, firstly because Vinicious is 10 times better than the next LaLiga player and some fans can't stand how good and dominant he is. Secondly, specially this year here in Spain he is the center of absolutely any game, and specially the media has created this weird discussion about his dancing and overall a really extrange narrative around him that promotes hate. Mainly this 2 things are making people hate on him and the most fucking retarded people to do so by being racist, because they are fucking racist. I do not know why don't they just double security and start banning them for life.
That being said again, stop fucking generalizing again. You can't go "not all barzilaians send death threats" and then "this country is racist" yk, it doesn't make sense. There is stupid people everywhere