It's funny you name-dropped Argentina later in the comment, because it was going to be my exact reply to your first question; Argies largely have no issue with immigration and have historically been an extremely welcoming nation, both as known in "meme culture" (the alleged Nazis in the South), and less known but equally as valid (the incredible Jewish migration, so much so that it almost made them create Israel there).
Your claim on Brazilians is not crazy and quite well-known to anyone who knows anything about LATAM, tbh. Korea and Europe aren't a secret, either. But I somehow doubt Argentina has anywhere near as strong a history to be placed amongst them. Care to enlighten me?
Honestly, French people shouldn't really be talking about any other countries' racism without checking their own first....
(Also

at the sheer amount of French colonialism denial in this thread, surprising and disgusting, as it always is).