Job listings that say "experience with FrameMaker/Madcap Flare/[whatever]". It's useless and arbitrary, and not unlike asking a programmer to have experience with Visual Studio or Eclipse. Technical writing--and writing in general--existed long before the age of computers, MS Office, and content management systems. I think it's done because HR doesn't really know how to filter these kinds of resumes.
(Not that it matters to me because I have experience with these tools, but it bothers me because it demonstrates a fundamental misunderstanding of what a technical writer is and does.)
This complaint does not apply to a statement like "experience with DITA and XML a must". To me this is like asking for experience with Python for a dev position, ie, meaningful.
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As a hobbyist programmer:
1) Code that isn't properly whitespaced
2) Dbag comments in code (Last night's doozy was "With liberty and justice for all")
3) Dbag responses to questions that amount to little more than "RTFM". These are profoundly unhelpful and serve only to boost the ego of the person posting them. They are not meant to be helpful or instructive to the person who needs the help.
(I'm sorry to say that I'm guilty of having done all of these things in the past.)
1. People who cannot wait and honk even if they see that I am waiting for people to cross the crosswalk and not just blocking the intersection. For the record, I do NOT like to block the intersection. #MarylandUSADrivers
Especially if they are Python programmers.