It never ceases to amaze me how foreigners travel to the US, knowing the tipping custom, fake ignorance and do not tip. Congrats. You just tied up someones table for an hour and left them to make 2.25 or whatever it is an hour.
If you do not want to tip, DO NOT EAT OUT. Or go to McDonalds.
What kills me most is the sheer hypocrisy of the idiots not tipping. They complain about how the employees are paid low wages so to show them they fuck over the same employee with no tip.