That’s because there is no way to communicate with anyone not on your friends list other than 6 canned emotes, which of course are perfectly polite and civil. That said, other players have absolutely no issues letting you know you’re the stupidest piece of $#!+ around with merely two of them, so...
I might try it then. I never knew how to shut off chat in WCIII other than to /squelch someone, so I could live with some canned communication.