Cocky? I would say someone who is overly self confident when they have no right to be... Someone who doesn't have any regard for other people and thinks they're better than everyone/everything else.. they of course present this in a very forward, upfront manner.
Alexi is not cocky. he's successful. He's a Metal musician, and one of the best in the scene today.
Maybe sometimes he's stressed, sick, tired, or just flat out exausted so he can come across to be a dick, or cocky... but, as a person, I don't think he is at all.