Was I in the wrong?

[Canadane]

Mission successful, then.

[SenorPatty]

Mission successful, then.

Can I steal this gif?

[frostmagemari]

I haven't tank in a min, I pull a mob that could be avoided and then it started. They consent laugh at you emotes and the snide remarks about my rotation. At this point I have no said a word why this is happening. So I got fed up before the second boss and vote to kick for harassment. Apperly the other dps agreed and he was kicked from group. He friend call us both idiots and said reported for false boot then left. We re qued and beat dungeon. My point stands he was rude and I didn't say one word.

Not saying you did anything against the rules, because you didn't; but why was your first response to kick him for harassment (even though you keep claiming you didn't actually kick him for that reason, but for slowing down the dungeon) and not to ask him to knock it off?
Maybe it wouldn't have done anything, but it seems odd that the go-to decision was to refuse to speak and move straight to just removing them.

[Ronduwil]

Not saying you did anything against the rules, because you didn't; but why was your first response to kick him for harassment (even though you keep claiming you didn't actually kick him for that reason, but for slowing down the dungeon) and not to ask him to knock it off?

Have you dealt with a bully before? They get a kick out of annoying you. Demonstrating annoyance will almost certainly encourage and reinforce the behavior. I think the OP's response was warranted and correct.