Fanboys in the PR Fandom.

I've just had an encounter with a JDF fanboy... Wow, throwing their rattle out of the pram is an understatement. I thought it was healthy to address this as a problem within the fandom, to generate open discussion about it. Is it healthy to be so obsessed with something, that you can find no fault in it whatsoever? Is it 'derogatory' to call someone a fanboy if you see them behaving this way about something? Apparently, it is (somehow) but I wanted to know what other people think. So, fire away!