Quality is quality and crap is crap, no matter the genre, and uncritically accepting poorly crafted trash just encourages more of it.
I don't think anybody has a problem with you not liking particular movies, do they? I don't have a problem with it. However, while something might be "garbage" to you, doesn't mean it is to me...
This is also where respecting other's opinions comes into play rather than making comments such as "accepting poorly crafted trash just encourages more of it" which implies what I like is trash. However, if I like it then I hardly consider it "trash" even if I sometimes say self-derogatory things like "if I didn't like it, you know it was bad."
I happen to like a lot of things other people think were bad. I happened to like Daredevil, the 2004 Punisher movie... heck, I'm going to buy the 1990 Captain America movie when it comes out on BluRay next month. I wouldn't spend money on it if I thought it was trash.
There are other movies I didn't like that I'd rather not see again... The Green Hornet, Elektra, Catwoman, Blade 3, X-Men 3 and list goes on. But I don't think liking particular movies encourages the making of more trash and just because I didn't like some movies doesn't mean I want them to stop making superhero movies... that's simply throwing the baby out with the bathwater in my opinion.
Furthermore, as I posted in a previous thread, superhero movies are still a rare genre. Despite what people keep saying, there are anywhere from 3-6 per year out of some 250-350 movies that are ranked annually. So, yeah, I'd like to encourage more. The only movies I'll see in the theater this year will likely wind up being limited to Thor, Green Lantern, Captain America, X-Men First Class plus Harry Potter and Bridesmaids at my wife's request.