I get that it's a pretty minor incident in the grand scheme of things, but you need to consider we don't know what may have been said between him and management before it.
Plus, Tony was never long for this team - or any team, for that matter. He was bought out, signed on the bargain bin, traded for/signed by a team who then bought him out AGAIN, and then signed again by seemingly the only team who can tolerate him. When that team had a bunch of defensemen leave in FA, he was told "No thanks" and will probably be off to the KHL.
He's clearly not a guy who endears himself to coaching staffs or front offices. He's just not worth the headache and multiple teams have proven that at this point.