Well, this wasn't rude so much as weird. My friend who is also supervisor to 3 PhDs is pretty stressed at the mo, and on wed afternoon, she said that she'd brought in a flask of wiskey, to "nip the edge off the afternoons". Then she asked me if I thought this was weird/unacceptable. I said that I thought it was a little. Then she said to me, "well, do you think wine would be better?"!!!