Yes, clearly you are that stupid. You yourself used the example of two private competitors in the SAME city, and I pointed out how that was a useless analogy.
No, it's not a big deal and no I am not upset (I couldn't care less about either team), but Lebron is not just SOME fan as the other idiot tries to make him out to be to support his contention. Lebron is an icon, a symbol for Cleveland, and not just a sports symbol but a PR machine for the city and the subsequent impact of the success of the sports franchise on the local economy. As such, he is held to a higher standard like any public figure.
I doubt anyone within the city would really care if he truly was a Yankees fan, as long as he's not rubbing it in their faces. You will not catch Alan Iverson, gangsta that he is, wearing a Phillies cap at the Rockies-Phils game tomorrow, despite cultivating his career in Philadelphia. In fact, he has been seen wearing Rockies gear, and I highly doubt he has been a lifelong fan, because he understands the importance of it to the city. LeBron is inarguably classless.