It's the catch-all euphemism of our time.
The doctor saying "you're a big girl" isn't inappropriate. It's unprofessional and/or sexist and/or rude and grounds for complaint.
The poster's daughter drinking vodka at school wasn't inappropriate it was illegal.
The poster's husband calling her a c**t wasn't inappropriate it was insulting, misogynistic and worse
Rant over - as you were!