Yes, a cashier at CVS pharmacy, a delivery driver at amazon, or a waiter at KFC, should be able to afford rent, groceries, and bills with their paycheck alone. That is exactly what jobs are for.
I believe that people's actions can make it clear that they have no respect or regard for you, regardless of what they say. Their actions clearly indicate that they don't value you. When you notice this, take it for what is. Remember, actions speak louder than words.