I'm not going to listen to my swimming instructor.
Why aren't you going to listen to them?
I don't need to because the class is too easy for me.
It's a bad idea to not listen to your swimming instructor because they're trying to help you become a better swimmer. If you don't listen to them you won't learn as much, and it might be dangerous because you could drown.
I can learn without listening to them.
It's a shame to not listen to your instructor. They are there to help you learn, you're only hurting yourself by not listening to them.