Being picky about your tools and what you produce should be a positive sign. It shows that you care. It doesn't say anything about how flexible the person is.
I wouldn't send out postscript files to people I don't know, since you can't assume that people are able to read them.
I assume your comment was purely about the social point of view? Or are there technical reasons for foregoing postscript documents you may want to print? (Especially reasons that didn't exist 30 years ago.) Thanks!
I wouldn't want to force other people (especially non-geeks) to learn about data formats they don't care about. And after all a pdf is still better than MS Word.