At that age I could've exclaimed something along those lines to my teacher's face and they'd just have laughed at me and asked me to calm down.
If I pulled that at work I'd be asked whether everything is alright.
Apparently nowadays the appropriate response to a child throwing a tantrum or having a mental breakdown is to have one as well.
Some school faculty and administration are incredibly petty and vindictive. Certainly not all but a lot. Grown adults absolutely pick favorites, bully students, talk down to them, and carry out petty beefs for any reason or no reason at all. Sometimes they hurt the children to get back at parents they don't like. Sometimes they (for whatever reason) seek validation from students and will participate in bullying of unpopular students. These can be trivial things, like accepting late work from some students but no others or grading one student's work more harshly. Other times they believe they are doing a student good by "teaching them a lesson" or expressing their disapproval of the student or family's lifestyle.
I have absolutely no problem believing the school administration and coach were offended and rather than discussing it with the 14 year old they decided to prove who was boss by punishing her.
Sayre's law makes a return
PA has some extreme deep south vibes in some areas that constitute an aggressive hatred and power addiction over younger people.
The worst case I experienced was when a gym teacher was teaching a "graduation course" which was required to be passed in order to graduate. We were the first year to have this class, and I was in the first semester, part of the guinea pig group. We had a semester long project and the teacher in charge would not approve my project because it did not involve raising money for charity (not a requirement on the rubric). Some students sold t-shirts, some organized 5k runs, others wrote children's books. We were encouraged to make money for a cause, but it was not required. I wanted to build an Android app since Android was recently released, and I wanted to make something anyone could use.
The teacher repeatedly told me to go back to the drawing board, fabricating missed requirements that were not on the rubric. Only on the final day of project approvals did he say I needed to raise money, which was not a requirement (more like a suggestion or even trend). I never got the approval, so I shouldn't have passed, but he didn't bring it up the rest of the semester and never looked at my work afterwards.
Final day presentations, the principal (awesome guy who knew nearly every student) watches and asks what I thought about the class and I told my experience. They got rid of that "graduation project" class the following year, and the next semester had all new teachers for it. Half of the kids didn't even donate the money they made.
tl;dr - almost didn't graduate high school because a gym teacher wanted me to raise money as part of a project.