Thanks to everyone above for your input. Yeah, unless I spend a lot of time in this forum and get to know posters by their comments, then humor can be a little out of place. I usually use just kidding (jk) or try to let people know I'm being sarcastic, but not hurtful. However, this is not always true, as for example when I mocked relationship threads with "Mega-Shark vs Giant Octopus" Relationship Thread.
To Fems: Anything I can do to help people sleep better,

. I'm more formal, and probably much more exciting in my own mind, than for other posters. I think Daniel Jackson had a similar problem before he met Vala. I could probably use some exciting signatures and pictures, too.
To Snowman: I don't know if I'd obsess over Scifi. I guess people are more familiar with sports (hockey, american football, soccer, etc) than with the episodes of Stargate or Star Trek, so people respond more positively to that "shared" experience. I may be looking for more friends to share scifi with, and my subconscious nudged me towards this forum,

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The "stigma" I'm talking about is how, at least for me, scifi has been associated with shyness, being anti-social, living in a basement, etc. It can just as easily be associated with intelligence, creativity, high tech, internet startup success, etc.