Prejudice against speculative fiction

do you think that there is prejudice against fantasy and science fiction? (Fantasy, Science fiction etc')
If so, why? Is it justified?

Yes there is. Rightfully so, too. There's a lot of sci-fi/fantasy out there that's absolute shit, and it deserves to be scalded like harlequin romances. But on the other hand there's stuff like "Fahrenheit 451" which gets stuck in science fiction when it's good enough to be considered literature, alongside "1984." Even Ray Bradbury's non science-fiction stuff like "Dandelion Wine" get crammed in science fiction.

Seriously though, the day I find Harry Potter and Terry Pratchett and shit like that in literature isles of bookstores is the day I start pulling my hair out.