Anyone defending this guy needs to step back and realize what happened.  He was trying to be a know-it-all and use up all the time he could to himself.  And then he started yelling and causing a scene.  He did not listen to security. He can go outside and yell, but inside if security says you're done and you've made your point, sit down.  And then he wouldn't leave, yelled more, that could have started a riot, after refusing to leave he was trespassing.  Did he deserve a tazer? not my call.