I must say that there is precisely nothing offensive/rude/annoying which any stranger on the Internet could say to me (well, could cause to appear on my monitor screen) which would trouble me to the extent that I'd feel impelled to block them - much as there's likewise nothing offensive which a stranger in the street could say to me which would cause me to do anything other than walk away from them. Why would I be disturbed by the opinion of a stranger, after all - or even a passing acquaintance, for that matter? I've been on the Internet since before even the most simple Internet Relay Chat (IRC) was released to the general public, meaning that the only way to 'talk' to anyone online was to use email and/or static BBSs (Bulletin Boards, i.e. the far more basic and text-only forerunners - often hosted on UseNet - of more complicated and more controlled Forums like this one).
And although almost none of those old BBSs had any 'moderators', as such, in all of my 35+ years online I've never once felt the need to block (let alone report to a 'higher authority') any other person I've encountered via the Net, whether within or outside of online games... even though some of them have certainly been far from polite and friendly. I genuinely can't understand why anyone cares about the opinions, criticisms, and/or abusive remarks of what amounts to text strings on a screen... which is all that ANY Internet stranger actually is. Just some alphabetical characters on a screen, sometimes plus/minus some very frequently inaccurate pictorial representation of themselves. To me, that's such a non-existent and impotent 'threat' that I can't even be bothered to block them... I just leave them shouting away all by themselves, until they (rapidly) get bored and simply go away.
Whatever happened to the good old Net philosophy - again, originating from the days when BBSs/Forums rarely even had 'moderators' - of 'Don't Feed The Troll'...? It worked just brilliantly, for years, although it's largely neglected nowadays, it seems, in favour of the "Just block them!" solution.