Let's be honest here, you've already made up your mind about Rex with your "The Bills took a step back..." thread, there was no way this PC was going to change your mind.
What does being proven have to do with being a bully? Why do they have to prove themselves first, to be bullies? He's talking about not getting pushed around, not being the brunt of jokes. That's not theatrics, that's Rex establishing the identity of the team. This is what the Bills will be. Is it a bit in your face? Sure, but that's Rex Ryan, he's a confident guy. He's confident in his ablility and in himself.