It doesn't really matter how much of an attention seeker Andrew Meyer may or may not be. It's irrelevant to what happened. Yes, he was making a nuisance of himself by asking questions when the Q&A session had been closed. But he was tasered after he had already been wrestled to the ground and was held by 5 police officers. He had at least one handcuff on already. At am minimum that is bad police work, at worst that is excessive use of force. Andrew Meyer did not pose a threat to anyone. The fact that he tried to pull his arms away from those trying to restrain him doesn't tell me anything. That would be a normal physical reaction to being restrained against your will.
The focus is being shifted away from the incident and towards Meyer's personality (flaws). Even though the Q&A session was closed, Kerry had already said he would answer the questions. It is unfortunate the opportunity to hear the response was lost.