Even multi-accounts are allowed in the forum, that's not an offense that can cause ban.
Of course, there are many who don't like others tell they're wrong, especially if the others are lower ranked (although that should not matter if there would be a fair exchange of opinions).
As you can see, 1miau has answered him that he's wrong in those opinions. The rest.. is just cheap talk.

Believe it or not, freedom of speech (like on this forum) also means that some will say that Putin is great (even if every sane person knows that he's just another war criminal) and their posts are allowed. You have to either grow a thicker skin, either press the ignore link. As simple as that.