First, you come off as highly dismissive of teachers in general. Grammar, body language, word choice, and even the way someone conjugates "to be" is often linked to a person's ethnicity, socioeconomic status, or cultural group. To compare that to the language found in "a prison yard" is insulting and makes me think you're more focused on judging how these teachers speak than on addressing the actual concerns they raised.
Likewise, your calculation on how many hours teachers work is a best-case estimate. I'm not a teacher but I know many, and I went to public school. So I know just how often teachers get to school 30mins to an hour early to prep, work through their lunches, and stay hours after to help students, grade tests, write letters of recommendation, meet with parents, and host clubs or coach sports. And then there are the multiple days at the end of each quarter when teachers work through nights and weekends putting together progress reports. Do you want to factor that into your estimate?
Also, I'm not sure how it is in Jersey City, but most teachers I know spend hundreds of dollars out of their own money on supplies each year because school districts don't have the cash to pay for pencils and paper and other basic supplies.
What school boards need is not someone who is antagonistic to teachers, but someone who is willing to work with them.