Sometimes I forget why I despise people

Fortunately, there is almost always someone there to remind me. For instance, tonight after work I stopped by the service station. The line was fairly short, no problem. We are waiting in line and this old guy makes some small purchase, then asks where the Fairfield Inn is. I have lived in the area for something like 3 years now and I have no clue. Fortunately, he wasn't asking me, he was asking the cashier.
"I am not sure, sir," she replied. Someone asked, "Isn't that the place across the freeway?" Several people replied, some assenting, some denying, some simply affirming they did not know. But this old fart, that wasn't good enough for him. He did not hear any of it because he was too busy berating the hapless cashier. "Why do you even work here?" was one comment I heard...as if knowing where some hotel is located is part of the job description for a small neighborhood gas station.
I would like to think this is not part of it, but the girl behind the counter is not white. I am not sure if she is Indian (as in the country India), Pakistani, Iranian, or something else. AAnd, to be honest, I don't really care. As far as I am concerned, she is simply someone working at a gas station. But I got the distinct impression part of his ire was he was old and she wasn't white. As he continued to berate her I could not help myself, I simply had to interject, "You, sir, are a jackass." And at this point in time, my only regret is I did not use stronger language.
I do not understand why people think whatever snippet of information they are seeking at any given moment is the responsibility of whoever stands in front of them to know. Do some work yourself, stop being a lazy bum. Words of advice. Words to live by. Now if you will excuse me, I see someone walking by. I need to go ask them what the square root of a hypotenuse triangle is.