...[T]he only means I have to stop ignorant snobs from behaving towards genre fiction with snobbish ignorance is to not reinforce their ignorance and snobbery by lying and saying that when I write SF it isn't SF, but to tell them more or less patiently for forty or fifty years that they are wrong to exclude SF and fantasy from literature, and proving my arguments by writing well.
The instruction here is not for every kind of writer - not for the writer of nurse books or thrillers or porno or the cheaper sort of sci-fi - though it is true that what holds for the most serious kind of fiction will generally hold for junk fiction as well. (Not everyone is capable of writing junk fiction: It requires an authentic junk mind. Most creative-writing teachers have had the experience of occasionally helping to produce, by accident, a pornographer. The most elegant techniques in the world, filtered through a junk mind, become elegant junk techniques.)
At this point, a few words on this term 'horror' are perhaps called for. Some amateurs of this kind of literature engage in endless hairsplitting disputes, centered around this word and its close companion 'terror', as to which' stories may so be categorized and which may not, and whether or not descriptions such as weird or fantasy or macabre are preferable. The designation 'horror', with its connotations of revulsion, satisfies me no more than it does the purists but I believe that it is the only term which embraces all the stories in this collection and which succinctly suggests to the majority of readers what is in store for them. Horror then, in this instance, covers tales of the Supernatural and of physical terror, of ghosts and necromancy and of inhuman violence and all the dark corners and crevices of human belief and behavior that lie in between. ("An Age In Horror" - introduction)
People who make snide comments to authors like "anyone can write a book" or "well, you did it, so obviously I can/it can't be that hard" or poke at a book because it's "romance" or "genre fiction" and act like that somehow makes it substandard because they don't read it... well, ok, go ahead. Write a bestseller. Don't forget to go through the correct edit process. We'll wait.
...I’ve never understood the logic that says a work doesn’t need to be judged on the quality of its writing or characters simply because its genre. On the other hand, I’ve also never understood the logic of excusing a work from the need to tell a story worth telling about people worth knowing simply because the author writes pretty language or has some insights to offer.