Once you are nto the business of offering services and product delivery to different customers,you are bound to face people with different temprament,the best way to do this is to expect it,so it would'nt come to you as a surprise.Some customers can be very rude and annoying, and the only way to deal with such customers is to endure with their bad characters and attitude for the main time they will be around your business environment to avoid unnecessary scene.