Bingo! Just think of the comic bookstore character in "The Simpsons". I work in IT, and it's full of arrogant, condescending, bloated geeks just like that guy, who are always trying to convince everyone else that they are geniuses, simply because they know some obscure stuff. They're amusing at best.
I know exactly the type you're referring to. They are part of the reason that I began to distance myself from the Linux Users Group that I used to be a part of. Somehow, helping people with Linux issues degenerated into that must-convert-everyone-to-Linux and Bill-Gates-is-the-devil mentality that seems to be rampant among IT types.