I don't want to get into a slinging match and derail the thread, but since you asked, two things.
Firstly, you're supporting a guy who has switched teams akin to changing from Spurs to Woolwich. I mean, wtf, is that even possible?
Secondly, a lot, and I'm not saying all, but a lot of Americans do not share the same loyalty, love, frenzied passion, that we over here do for our clubs. I say this with spending near 2 years living in the U.S. It's a pastime for a lot of those folks, and isn't in their DNA to posses lifelong traits of character that I have just mentioned.
A lot of the support is materialistic and frankly, just something to do. For example, my brothers mate went to USC, or somewhere, wherever reggie bush went to school. On his first day he went to introduce himself to his dorm neighbour and upon entering he was greeted with Norwich City merchandise displayed literally everywhere in the room. Green and yellow bedspread, posters, lamps you name it, if the club shop sold it he'd bought it. Now fair play to the lad, often my brothers mate would hear him stay up or wake up in the wee small hours of the night and watch Norwich play. Awesome commitment, I admit.
This confused my brothers mate, as he knew the guy had never been to the UK never mind Norwich, so he asked the Norwich fan why he supports the club. His answer...'I like the Canary on the badge, bro'.
Its a pastime, not a livelihood. I mean one day, when that chap decides he likes owls more than canaries, odds on his room will be covered in blue and white.