A "public school" in the US is a school where the kids go that can't afford to pay for a "private School". Public schools are funded by taxing the neighbourhood's houses and shops. If you live in a poor neighbourhood, then you have poor public schools. Teaching a kid how to squirt milk out of his eyes might be the best education he will ever get.
I grew up in a very poor neighborhood and went to a very poor public school in the Detroit area. Most of my education I got from my uncle who was a professor at the University of Detroit. This way I didn't have to learn to squirt milk out of my eyes to make a living in a freak show.