How come comic books have such a bad reputation?

Hi! This is my first question im asking on funadvice. I’ve been a comic book fan since the 4th grade (im in 11th now) and I when some people (nongeeks/popular) find out that I collect them and read them they they just call me a nerd, say why waste your money or laugh. Its really no big deal…comic books are just a form of entertainment and art just like movies, regular books and music. And movies, regular books and music in general dont have a bad rep. So my question is, why do some people label comic books as a bad thing? I mean 9 times out of 10 they like the big blockbuster movie adaptations of comic books (spiderman, x-men, iron man, sin city and a ton of other movies they made) so what is wrong with liking the original material?