1. Tips are part of the cost of your meal in the US. In most places, the tip should be 15%; in places with higher costs of living, like New York City and San Francisco, they go higher. If the meal and service are adequate, not to tip is very rude. However, a tip may be adjusted downward when service is inadequate.
2. A customer has the right to expect:
-Prompt service
-Polite attitudes from staff and management
-A clean table and restroom
-Properly prepared food and drinks
-To receive what they actually ordered
-To be charged only for what was actually ordered
-To have coupons, discounts, and promotions honored by the restaurant within the designated time frame
-To know that food and drinks are not made with ingredients they must avoid
-Not to be disturbed by staff, other customers, or their children
-To be allowed to finish one's meal while the restaurant is open for business
-To have errors by staff in service or etiquette corrected
3. Customers do not have the right to expect:
-To bring food or drink in from outside the restaurant
-To allow their children to roam about without supervision or to disturb others
-To treat staff with rudeness, regardless of problems
-To disturb other patrons, regardless of problems
-To demand any food or drink not on the menu
-To have properly cooked and served meals or drinks comped by management
-To linger once the meal has been paid for, especially after closing time
-To be allowed to smoke in "non-smoking" restaurants or areas of the restaurant