To get kicked out of an event for saying your opinion? If I got kicked out of every show that I made fun of the shit openers, I would never see anyone. It's an opinion. This guy took it way too far. It just made it seem like this ass hole did it because "Look at me everyone I'm awesome and can kick this guy out!" fuck that. That is a fan who came to see HIS show, not the openers. He deserves to have no fans with an attitude like that.
I'm not gonna sit here and act like I LOVE sitting through openers all the time but if you are going to act like an asshole to the openers, and make shitty comments to them (in person, or on twitter) you should either show up later, or stay the fuck home. The "came to see HIS show, not the openers." mentality is what ruins shows, and makes opening slots hell a lot of times.