I once got kicked because I felt a bit... petty I guess.

Got into a Stone Vigil party with a SCH, MCH, and a BLM, which was neat.
But for some reason the BLM insisted on running ahead of me, attacking the mobs before I even got there and at least once go to a completely different room just to aggro the mobs there and bring them to me.

I spent most of the time just kinda waiting for the BLM to die whenever they aggroed stuff before me and only take the aggro once they were down, or if the monsters were slapping someone else in the party.
The entier run was like that.
Once we reached the last boss and I finally got the chance to ready check, but both the SCH and the BLM didn't check for ready.
A few moments of silent later I get kicked.

I probably deserved that very very much but I was so utterly annoyed over how they would not stop running ahead even when I asked them not to.
I feel bad for the MCH for getting caught up in my pettyness, they were neat.