Well I've only been playing the game for a month a half and have only had one instance of a player being kicked. But it took the entirety of Toto-Rak before we finally decided on kicking him. Basically he was the healer and the only time he cast cure was when he healed himself, it reminded me of this actually: https://www.youtube.com/watch?v=DHpPKgi-niI.

We gave him the benefit of the doubt and got to to the final boss, which he triggered solo and used limit break. So we gave him half an hour of grace before we were 100% that he was trolling. Upon which he was kicked as we would have struggled without a healer for the boss.