Lower class always tips more than upper/upper middle class

I live in a rural area, so I'm not doordashing in the city. It's always the customers who live in trailer parks or on chicken farms that end up tipping $15+ on orders. I took a low offer order to keep acceptance rate up recently and drove 8 minutes outside of the delivery radius to deliver an order to a Mcmansion that left a $1 tip. It's always the rich neighborhoods that leave a $5 max tip (if I'm lucky).