Why is it bad to be cheeky to teachers?

Answer 1

Some teachers will take it as being disrespectful to them. It can be seen as being too "familiar" with the teacher, and treating them more like a friend than an authority figure... and some teachers will feel like that will make other students in the class less likely to respect the teacher or classroom rules, etc. When I was a teacher, I always encouraged students to be themselves and be relaxed enough in class that sometimes they did get "cheeky." I'd usually just smile and say "Ok, crossing a line there!"... and that would help students know where the boundaries were.