As someone who did work in fast food, I went in thinking all the reddit stories were gonna be true and I was gonna be screamed at all day, every day.
Turns out, contrary to popular belief, 90+% of fast food customers were "neutral" or better. And of the ones that did get pissy, most of them werent mad at you, but the establishment and were fairly decent about it. As long as you didnt take it personally, you'd be fine. I invite all of you to go people-watching at your local mcdonalds if you have free time to test this theory out.
And as for wages? Yeah $11/hour might not be enough to raise a family on where the guy was, but if he was living with his parents or something, I'd guess it feels like a lot.