It's a big thread -- I assumed she was talking to someone other than you or me.
I don't think Mac users are hipsters, but I do remember that -- at least for awhile there -- all the really nice artistic programs (including Scrivener!) were Mac-only. So I think that's where the stereotype came from.
I want to be artistic and sync with Scrivener but the Windows version hasn't been updated yet I don't think.