That's your opinion, which is fine, but I don't see a problem with having Yankee game threads. Without them, discussion about their games will end up in the Sox game thread.
Coming down the stretch with the records so close, people are going to be scoreboard watching. I would prefer that they were 7 games out and of no concern to us, but that is not the case. We have our fate in our own hands, but what they do affects us now. People are going to want to talk about it, especially while it is happening.
Yankee fans will come to this site for one reason; it is a Sox site. Having a game thread, or not, will not deter them from posting.