50% tip not enough now?

I gave a $10 tip on an order under $20 and when the driver showed up he looked pissed and didn't say a word. Not a thank you, not even a nod. This was a couple of weeks ago and I haven't used doordash since. Why was there zero gratitude from this guy? And why should I spend extra money when I can just drive down the street myself and not even use doordash, if giving you guys business is met with such ingratitude?