I'm also from the United States and experience the same thing. But I feel as though I began supporting Everton for reasons that transcend the glory of winning a trophy.
What I've always found interesting with the United, Chelsea, Arsenal, etc. supporters over here is that so few bother watching the matches. They might if its a derby or maybe a big Champions League match, but so many just wear the kit and spout off when their club wins something worthwhile.
For me, watching Everton is something I crave week to week, even now in the team's sorry state. I guess I'd rather be laughed at for supporting a club passionately than supporting one only when they win.