Especially while driving. I found that if I felt bad for idiot drivers as their lives must be much harder than mine due to their latent impatience, rage, or incompetent, I was much less stressed. Just let them get on with it, slow down, and get home safe.
Now I almost never drive and that has helped even more.
Ironically, doordash had "you don't need to tip, we charge the fee to pay a living wage!" as it's original way to differentiate itself from you having The Pizza guy deliver.
Back in beta there was no tip option.
I stopped using them when they started to have separate tips for the in house staff and the driver, plus a 20% fee. Turns out your can pick up your own hot food faster for much less money.