I don't understand how some of these people survive everyday life.

Do you really not understand how a checkout counter works, middle-aged-white-lady? Why are you putting your card in the reader before the cashier has even rung up all your items? Why are you taking your soda off the belt? Why, when you realize you didn't pay for your soda, did you then pay for it in cash and wait for your change? Have you literally never bought anything before, or are you incapable of considering how your actions might affect others, or are you incapable of thinking more than three seconds ahead of the current moment?

How do these people survive everyday life if they can't even manage basic social awareness in one of the most common retail settings on the planet?