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Only Germany can make you feel bad for being only one "Dr"
(thelemmy.club)
General rules:
Exceptions may be made at the discretion of the mods.
We usually distinguish between qualification and title. Using your qualification to underline an argument is fine. Using your title to try and make yourself worth more than someone else is not. So "I'm a plumber by trade, I know how that plumbing has to be done properly" is OK. "My PhD makes me more important and helps me cope with my self worth problems" is not.