Perhaps he at one time (or still does, cant remember) had family in the area
Is there a distance that once you pass, you shouldnt be rooting for a team anymore? I just dont buy that. My wife is a HUGE Red Sox fan. Has been her whole life. She has not once stepped foot in Boston, and cheered for them in the good and the bad years.
Where I come from you root for the local team. Period. Having a sense of pride in where you're from and where you live is a way of life. Supporting all things local goes along with that type of mentality. Of course not all people agree with me and that's fine.