I've heard that this is somewhat common in nerdy communities, or at least common enough that someone felt moved to write about "geek social fallacies": http://www.plausiblydeniable.com/opinion/gsf.html
It's not really common in nerdy communities as such, just mostly those somewhere between the mainstream and the incredibly niche. There's an interesting TV Tropes write up on that here:
I run a nerdy community. #1 and #2 are so impossibly ingrained in my users that this was both painful and cathartic to read. The only "potential fix" the author has is for people to read this and recognize the signs, but #2 prevents me from telling anyone there about it sigh
http://tvtropes.org/pmwiki/pmwiki.php/Main/TheLawOfFanJackas...