As a child-less teacher, I’ve had a front-row seat to the many ways parenting shows up in children’s behavior. Behaviors teachers see that parents often don’t. In my nearly 16 years working in education, I’ve seen it all — the gentle, the challenging, and everything in between. Everyone loves and admires a well-behaved child. It’s instinctive. And whenever I encounter one, my first silent nod of appreciation goes to the parents because good discipline, respect, and empathy start at home. What I want to talk about, though, is not good behavior but the opposite: deeply disrespectful children, and the adults who defend them at all costs. It isn’t true that…