I work in a retail tech store. I'm pretty sure I know my stuff well but I have to do a lot of dumbing down just like Beedubya and I do work with the occasional idiot. I had one pc repair tech who though he could install a standard agp graphics card into a small form factor Gateway just by cutting it...lengthwise...with a razor blade...it didn't need all those extra capacitors apparently....
I also work with an older guy (still lives at home) who claims to have a bachelor's degree in Computer Science (not quite, similar major name but not really computer science) and didn't know what "dxdiag" was. Pretty sure I knew that since I was 12...
I really don't like other techy people who talk to me and assume I don't know anything, it does really get on my nerves. Kind of satisfying to turn something around on them that they don't know and leave them without an answer. At least that's satisfying.