I've definitely witnessed harassment. I've also seen abusive language and initiated a vote kick for it, which was carried through. Seen abusive language that another player said he'd report but the point was moot because the instance was over.

I've only seen constructive discussions on parsing, in groups whose intention was to pass an objective such as the new EX primals or Alex Savage. My own group has dropped players from our team for low numbers but we didn't cite parsing as the cause.

When you look at the list of reasons you can dismiss a player it's actually very narrow. Afk, offline, harassment, or cheating. You can't objectively kick people for not playing how you want to play. But people do that all the time. I'd call that abuse of the vote kick.