I'll admit I used to be a bit like that. During the days when I was still addicted to DBZ and Inuyasha and was just beginning to become a serious anime fan. Everything that wasn't some sort of creation from Japan was somehow inferior and I still believe that most anime is a lot better than the programs showing now on television particularly reality shows (chill of disgust goes down spine).
But that doesn't mean there isn't some worthwhile television programs (Mythbusters, Heroes, Supernanny, Wifeswap). As for comics, it's actually kind of hard for me to find those now. My town used to have a comic store but it burned down years ago. But my experience with American comics is limited so I can't really give an honest opinion.
It still bothers me, too, when people call anime cartoons. I know that anime is technically cartoons but when I hear them called that I feel that anime is being put on the same level as The Grimm Adventures of Billy and Mandy or something along those lines and that's just wrong to me.
But it seems to me that this sort of attitude comes primarily from new or young fans and over time just fades away. Keyword though is usually.