Treat them like a human, not a robot
"Use basic manners. Don't touch your server. Use your server's name. This should be self-explanatory, but a simple please and thank you goes a long way. Also, respect your server's personal space. They aren't something for you to touch or ogle at."
"Look me in the eyes when you speak to me, and use verbal communication like a human being. If you ask me for something without making eye contact, I immediately assume you're an a**hole."
"Don't use a cellphone while the waiter is at your table. When a waiter asks if you need something, don't ignore them."
Don't try to order off the kid's menu if you're an adult
"If you don't have the money to go out and eat, please don't go out to eat. Ordering off the kid's menu isn't endearing or cute. It's obnoxious."
Recognize that you are not any more important than anyone else in the room
"I've had plenty of times where a customer acts like they're the most important table I have, just because they ordered more food/sat down first/are a d-bag. Wait five minutes for your beer: there are 40 other people in this restaurant, you sh*t."