This is how I know you're lying. Either about being a teacher or what you have seen, or what you teach.
If you've never seen a parent teacher conference get heated, then you have either never participated in one or . . . well no, that is the only possibility, other than some near impossible statistical anomoly in which you have been to a handful and none of them got heated.
Parent teacher meetings get heated. As a brand new teacher the third one I was in overheated within the first thirty seconds, with mom litterally yelling "I know my rights!" My department chair was interning as an administrator trainee, but she went to get the principal to sit in when mom started getting loud.
That mom was mean, a toxic parent (of eleven kids), and probably one of the worst human beings I have ever known. But she had a right to disagree with the school and WITHOUT being investigated by the FBI and given an EDUOFFICIALS label in her file.