Negative feedback can be a net good for anyone, even if they don't like it in the moment, and even for conglomerate entities like a school. Petty bureaucratic admins abusing their authority to spite you are likely abusing it against others under their purview. Honestly if you feel you have an allegiance to the school there's an argument that it's your duty to oppose petty tyrants within it. Think of it as a service to the the ideal of the school.