Earlier quoted context omitted.
Without a doubt all of the best teachers I know say the worst parts of their job is dealing with parents. Many of them who have talked about quitting have almost always cited the parents as the biggest problem. Also the worst parents are in the richest areas.
This is highly dependent on where you teach. Teach in poor areas and student behavior is going to be your biggest issue because of bad parenting
The rich parent is the one who is going to show up after the teacher disciplines a kid insisting their little darling would never do such a thing.