Every activity that involves other people has given standards for etiquette. You know, the customary rules of behavior that experienced folks just seem to know even though there may not be flashing signs on the wall explaining said expectations.
For example, when dining at Chez Raison d’Etre, you’re not supposed to drink out of the finger bowl even though it appears to contain perfectly good water. Apparently, you shouldn't ask for a straw for your Champagne de Saint Gaul Orpale Blanc de Blancs either. Don’t ask me how I know.