I just don't understand why you bother engaging with these people.

Ignore them and let them vent off enough steam to the point where they say something reportable. Then report them and /glow in the knowledge they're either getting a warning, a ban or at least a step up towards one.
Or install a mod that only lets guildies and friends talk to you if you want to go that far.

Just....don't talk to them.

Is it just me?