This occurred in a Florida school and my understanding from both black and white teachers in Florida schools is that in many schools students are in fact allowed to do more or less anything they want and that teachers can do nothing about it. It absolutely shows in the test scores by school. There are good schools with higher parental socio-economic status but many schools with title I funding have almost all students failing the state tests. A black grad student of mine, a former college athlete and very strong, would say that students would swear at him, throw things, and so forth, knowing that he couldn't do anything about it. They wouldn't be suspended or anything.
The schools obviously have a responsibility to get control of the classrooms, though their hands are tied also by the fact that the calculation has been made that it is better for their futures if they are passed along and graduate, or at least stay in school, than if they go out on the street, are unemployed, get in trouble, and go to prison. But the big issue is a larger socio-economic issue where higher minimum wages, more job stability among the working class, higher earned income tax credits, and a host of other measures are needed to shore up lower socio-economic classes in a deeply unequal society. When parents are both working and have a stable living, you just don't get anywhere near as many such problems.