As for "what to do" when you get the debuff -- go play the way the GM's tell you you're supposed to when you get the debuff -- brainlessly farm kill honor.

Announce to /bg chat "Hey, if you're going to harass me with afk reports, I'm just going to consider this a FFA deathmatch instead of a strategy. You can all blame yourselves for the loss -- you're the ones forcing me to stay in combat rather than cap towers/get the mine/etc."

DO NOT harass them. Speak your piece and be done with it.
DO NOT fall for their tricks and start swearing.
LET THEM make fools of themselves.
LET THEM scream at you.
LET THEM swear at you.


Then open a mass GM ticket while you're farming kill honor and report them all for language and harassment. While /afk spamming you is not "reportable", verbal harassment and pottymouthing is. They'll learn to play nice one way or another.