Its obviously a bit exaggerated, but not far from the truth.
In my highschool, there were so many of those chav type foids, mainly white english, polish and black ones.
They were the most loud, obnoxious, orange fake tanned, caked in make up nasty slappers I've ever seen. They'd spend all lessons talking loudly, swearing at the teachers, or just walk out in the middle of the lesson because they couldn't be arsed.
This massive black shaniqwa chav hippo once pulled out a whole rotisserie chicken from her handbag, and started loudly eating it in one of my lessons one day.
I had to overhear on the daily conversations, like them asking eachother if they spit or swallow, how they had to blow some guy outside the shop so he would buy them cigarettes, who they hooked up with at some house party over the weekend etc.
Some of them would also insult my looks, calling me rat face etc, calling me a virgin, accusing me of being gay just to try and humiliate me. Asking mockingly why I never smile, saying they bet I've never had a girlfriend. Bad times.
Finishing HS was probably the happiest moment in my life. I remember on the last day, getting home, and just sitting at my desk laughing to myself, that it was finally over.