I'm not going to tip for food I ordered for pickup at denny's
Why are you refusing to tip someone?
I'm a reasonable man, I tip 10% for delivery, 15% for carry-out. IN denny's IN-HOUSE pickup, I tip nothing
You should always tip your servers. That's horrible that you don't tip at Denny's. It's a restaurant, so you should tip.
It's different. I go there for pick-up, so it shouldn't count.
But a person still prepares your food and gets everything set for  you. You should still tip these people.