ComputerWorld writer Steven J. Vaughan-Nichols takes a look at a couple of reasons why Linux isn't very popular on desktop PCs. You can read it at ComputerWorld. Here's one of them:
3) Too much bad techie attitude
In 2009, any reasonably smart person can use any major Linux distribution without much trouble. You can run Linux without ever seeing a shell or manually tuning a conf file. But what if someone new does run into a problem with installing Adobe Flash and asks for help online?
If he or she is lucky, they'll get a considerable and informative answer from an Ubuntu forum or LinuxQuestions. But all too often, I've seen such questions answered with responses like "RTFM you noob! What are you doing running that trash distro anyway! It's GNU/Linux, not Linux!"
Yeah, that's going to encourage new users. If you don't have anything nice and informative to say to new Linux users, then don't say anything. Far too many Linux users seem to confuse acting superior and being rude with how people should act online. It's not.