I didn't encourage him at all, other than letting him watch the 1999 World Series with me. He decided on his own to root for the Yankees.
I'd like to see a more level playing field, too (more revenue sharing, salary cap, etc.) But I have a great deal of respect for Joe Torre and players like Derek Jeter and Bernie Williams.
But it's your responsability to train up the boy in what is right. ;-)
SD