I usually do give a dollar tip for takeout at a pizza place, Subway and places that fix your food ‘to order, if they are pleasant and efficient. And let them keep the coin change at the fast food joints like McDonalds, Taco Bell, Sonic etc.
But if they demand or even merely ask for a tip, they don’t get anything, AND they lose a customer forever.
They get a free shake of my cane if they didn’t serve me.