Best thing to do is just mute people like this. If somebody’s so worried about telling you how wrong you are in something, you’re not going to be able to argue against them, they aren’t interested in seeing reason or considering other ideas.
MMOs like this always attract a lot of immature and ignorant children. Look at global chat, it’s overrun by racists, xenophobes, and trolls. I can’t remember the last time I saw a actual BR in chat, but every 5 seconds somebody’s complaining about them like it’s a real issue. These people make up reasons to get pissed - be it that they saw a Brazil player chatting to a friend, or a player who didn’t do what they think is the smart build route. It doesn’t affect them, but for some reason they feel the need to convince themselves it does affect them.