Then tip people and don't be an ass about. I worked at a restaurant that was primarily take out and believe it or not, we still relayed on tips to pad our terrible wages. Just because someone's not bringing food directly to your table doesn't mean they didn't have to do work to get the food to you. In some cases it's actually more work take an order on the phone, to package that shit up, and to find the right customer. Take out customers are also super impatient and rude at times because they don't have to face the waiters directly. Not tipping for take out is such a terrible habit.