I don't claim to be knowledgeable about any of the authors mentioned below; I'm just going on a gut feeling as I share my two cents on a couple demographics of people.
Kurt Vonnegut fans - I have never read a Kurt Vonnegut book. Ever. I may someday and think he's the best author ever. If that happens, I might spontaneously combust back into my 1990's high school and be a fucking nerd virgin that doesn't know shit about anything. I couldn't tell you Mr. Vonnegut's writing style, his politics, anything he's written, anything about him at all. There's a good chance that I hate the people who enthusiastically read him because I envision his books as a gateway to getting heavily involved in the sci-fi scene.
Grey's Anatomy viewers - [disclaimer: my wife "likes" this show; she is exempt] I hate this television show. However, unlike most of the garbage on this list, I am familiar. Quite familiar. True story here, one time a buddy of mine and I had girlfriends that watched Grey's. So the four of us watched it one night. Together. Only it got so bad that my buddy and I retreated to his spare bedroom and talked about downloading music. It was so bad that we didn't even download any music, we merely discussed the best methods for obtaining illegal downloads. Pathetic. If you are a fan of Grey's Anatomy, you are probably a chick. And are probably fat. Or hot. Or medium-hot. Doesn't matter, because broads of all hotness levels are inexplicably drawn to this show.
Chuck Palahniuk readers - Again, never read any of this dude's books. I watched Fight Club, thought it was kinda boring, and got on with my life. This is another one of those guilty by association deals. You a huge Palahuniak fan? You probably really suck. You are also probably a turd that thinks you're so cosmo, going to art shows while pretending to appreciate abstract art. Words cannot describe.
Youtube commenters - [editor's note: this particular commentary was removed by the CEO of heck yeah, man llc due to the racially charged nature.]
Jack Kerouac fans - Again, never read anything by Jack Kerouac. Haha, most of you are probably wondering whether I even read a book in middle or high school. I did. But I didn't read much then. I do more now. I actually have a theory that Jack Kerouac, Kurt Vonnegut and Chuck Palahniuk are all the same person. Despite the three of them being in various states of "alive", ranging from not to definitely, I remain convinced they may be the same person.
Dancing With the Stars fans - Never seen this show and never will. Unfortunately, I've twice seen an upcoming season's cast "leaked" during a television show. Yeah, the show I was watching was interrupted so the two dimwit hosts announce the new cast. I don't know what's worse, being actively interested in a show about shining -sub-stars DANCING, or being tricked into believe the d-listers on the show are actually stars. Chaz Bono, Ron Artest, some lady I've never heard of. Who the fuck are these people? Both the contestants and the fans.
Any other groups of fans that you'd like a commentary on?