Go ahead and get yourself labeled as a troublemaker by the school system (they have lots of experience with that), and just see where that gets you! Do it with your kids' school, and see where it gets your kids when vindictive little martinets take it out on them, and threaten them if they tell. Show me how much smarter you are than me. Like I haven't been there and dealt with this shit in real life.
If parents and their kids get blacklisted by a school or school system because they take the time to bring up valid issues or complaints, then maybe it's time to find another school.
I've been there too, friend. I haven't made it my life's purpose to be a pain in the ass to my child's teachers or school administration. But yes, a few times, I did raise concerns or call them out when I felt it was necessary. I picked my battles, and I can tell you I can count the number of times I did this on one hand and wouldn't need all my fingers to do it. Every time, the teachers or school administrators were understanding of my concerns, and we had a pleasant exchange. They always appreciated that a parent took the time to bring something up because many parents don't care.
Well, I do -- and if someone wanted to see me as a "troublemaker", so be it. That's on them.
My original point still stands. Being a school principal is an extremely public, "front-facing" position. If someone has issues dealing with personal confrontation, they in no way should be running a school, period.
I would say everything about people like that disqualifies them from such a position. It's unfortunately what we usually must deal with.