If I had to guess, you were probably dismissed for AFK. Typically if a person is far away from the rest of the party, and is unresponsive after being spoken to, I would assume they're afk rather than intentionally ignoring the group. Although, it could have been harassment if the group felt that you were intentionally trying to inhibit their play. Like that healer on coil T1 who insisted on soloing mobs for SB while the rest of our party was trying to kill Cadeucus.
But you didn't respond , so a GM will look at the chat logs, and IF they decide to question the poeple who voted you, can only take their word for it if they said they thought you were afk.
So no proper way to report this, but no real purpose in doing so either