There appears to be a sillly bias against science fiction. This is apparently related to the fact that up to the 1950's, science fiction was a genre of pulp fiction -- found chiefly in lurid magazines bearing such names as "Thrilling Wonder," "Planet," and "Amazing."
Then, finally, John W. Campbell, the editor of several science fiction magazines, was discovered by the literati -- and they saw that his perceptive editing and nurturing and mentoring of certain writers had resulted in a genre that could rival respectable mainstream fiction, whatever that was.
There had always been science fiction writers who were more than penny-a-word hacks -- going back to St. Thomas More, Edgar Allen Poe and H. G. Wells. But now many science fiction writers, such as Ray Bradbury, Isaac Asimov, and Arthur C. Clarke, were perceived to be artists.
"Your little friends are wrong. They have been affected by the skepticism of a skeptical age. They do not believe except what they see. They think that nothing can be which is not comprehensible by their little minds."