Having worked in pubs/hotels and shops, I'm always polite to the waiters/waitresses and shop workers ( in fact I'm always polite to everyone, it costs nothing) I appreciate all they do for me as I've been there,done that myself. Nothing annoys me more than bad manners and what used to annoy me most was men who used to whistle when they wanted your attention! RRR! I would purposely ignore them until they realised it was having no effect and they chose to speak properly, then when they said 'didn't you hear me?' I'd say 'sorry, I thought you'd lost your dog'