The only valid reasons for being kicked are:
- Being AFK for extended periods of time
- Being offline for extended periods of time
- Harassment of your fellow party members
- Cheating through third party tools or hacks (exploits too, but I don't think there are any left in the game)

Everything else is abuse of the vote dismissal feature. You can actually have disciplinary action taken if you can give the GMs enough information (i.e. when this occurred, who was in your party at the time, and so on). I, myself, was a victim of vote dismiss abuse recently when someone kicked me for apparently dealing too much damage (and thus taking aggro from the tank). It happens.