Maybe not patronizing, but it does hurt your case. My team recently went though to remove “please” from all dialogs because user testing found phrases like “please reload to active X” resulted in more people ignoring the dialog and later wondering why X wasn’t activated than just “reload to active X”. I assume the bartender has run similar experiments.

I agree it doesn't belong on what are essentially street signs for mass consumption (i.e. Please Stop).

If you are asking a fellow human being individually, I think treating others with respect only helps build a strong culture.