Parents like this are, for my lack of more professional vocabulary, annoying as fu**. I've encountered these kinds of parents when I was a practice teacher back in my senior high years and they do really get on my nerves. My partner teacher/mentor gave me the full authority of the class he's holding, saying it's for my field experience, but all I faced was complains about a simple child banters. There are also cases when they harass not just the teachers but even practice teachers like us if we gave their kids academic marks that doesn't satisfy them. I faced this one particular parent that harassed me just because I made her kid (the class' top 2) sit with the kid's "rival" a.k.a the class' top student, saying I was discriminating and instigating a dispute between the students. I made them sit beside each other because their seats are alphabetically arranged 🥹. Ever since then and for the entire time I am doing my job as the practice teacher, she never stopped harassing me to the point that my own school and my class advisor sent me to another school (they said it's for my own safety 🥹).