Honestly, I'm a bit jaded with all these questions about "the guy way to do things" that have been popping up on this board lately. If we told you it was unheard of for a straight guy to watch Glee, would that be the deciding factor in whether or not you transition? Of course it wouldn't, that sounds silly, right? This stuff really shouldn't matter. Now, I don't mind it when people are just looking for more masculine habits to adopt, I do the same thing myself. But worrying about every little thing is counter-productive and only creates unnecessary stress. Nobody is really paying attention to your every move and if they are, that's their problem. If you like Glee, that's cool. I like watching certain shows that most guys wouldn't admit to watching, and while I certainly don't tell people about them, I'm not going to stop just because it's not "manly enough." I just keep it to myself. My older brother still likes the Disney channel and my younger brother watches shows like Project Runway. I don't know how he defines his sexuality but that's not my concern. All I know is that you can like whatever the hell you want, and no matter what it is, there will be folks from all walks of life who enjoy that same thing, even if it's a minority.
So, any time you want to ask "would a guy do this," and you do it, the answer is yes. Do straight guys watch Glee? You are a straight guy, you watch Glee. The answer is yes. Be proud of it man. :p