I don't read fantasy by choice either. But as a teacher, I read all the books my kids were reading and became a Potter fan. It's been said a million times before, but I can personally attest to the fact that tons kids who would no more voluntarily pick up a book and read than they'd sprout wings and fly suddenly became readers because of the Harry Potter series, and their interest in books bled over into what might be considered more "serious" reading. To dismiss as "garbage" a series of books and movies that you've admittedly not read or seen is uncharacteristically prejudiced, particularly when it comes to a series that has had such a positive impact on so many young readers and made a middle class single mother the richest woman in Britain.
I'm thinking jealousy too.