Same boat but did have kids. I did actually have a teacher say this to me. Few years after highschool I want back for some event and said hello to this one assistant music teacher and offered my hand for a shake and he wouldn’t shake it. Said “you were trouble back then and you’re trouble now.” It’s the adults that are nutty. Kids are kids. If you yell and scream at them, they are going to yell and scream at others. If you say no to them for everything they will say no back to you for everything. Gotta level with them, give positive feedback.