As long as we're going to talk about the "classy thing to do", That would be to admit that you're too invested in a game that you have no control over. And you're angry at someone that left you're favorite team? Come on.
It's his life. Sorry you don't get to watch him become an all-time great, but it's his life. What's the point of being angry about it?
If you are part of the program then you might have a point. If not, it only impacts your source of entertainment. So why get angry?