@engineer,
I agree with you about settling these issues in courts (as I made clear earlier).
Your narrative is requires a subjective judgement about intent, as if you can read the minds of the administrators. It is a pretty common story template, the "powerful" conspiring to oppress the weak. But, are you really asserting that school administrators are consciously conspiring to hurt students? I don't think this is fair.
School administrators, whether they share your political positions or not, have the task of running a school, keeping discipline and providing an environment for learning and they need to do this while being accountable to their local community. Different administrators in different communities with different needs come up with different policies to run the school in the best way they can.
I taught Physics in a high school, I am not sure if you understand what a building with 1000 adolescents is like. A part of adolescence, for both boys and girls, is pushing limits with the expressing sexuality. Every school deals with this, and every school makes rules specifically to define appropriate behavior. This part of what school administrations do.
The very liberal high school School that my kids attended had a rule against "bare midriff". This is Cambridge MA, a very liberal community... and yet the "powerful" (as you say) still elected to clearly state standards for dressing.
I don't think your narrative is fair.