I find this hard to believe, but get it confirmed again and again: people tip their waitstaff much less, with great pride, when they find fault with their food at a restaurant. The waiter, of course, has nothing to do with the food. The waiter cannot control the chefs and will likely get heat from the cooks for even putting in your customized order. People who can't deal with restaurant menus should stay home, to stiff a waiter who has given up his life, is away from his kids, who could be doing something other than running around for you doing your bidding is so hateful. 20% people. Or stay home. And please shame your friends who don't.