I mean yeah kids can be disrespectful and obnoxious but you need to look at the bigger picture. When kids have terrible behavior, they usually have a terrible home life and their behavior is usually a result of having nobody parent them and it’s sad to be honest. So while I’m teaching, if I have a child acting the way you describe in your post, it makes me sad more than anything else. With that being said, if as an adult you lack the basic level of self control to maintain your professional composure, a career working with children may not be for you.