My dog likes the word no

I have a cockapoo, he’s 12 weeks old and currently in puppy classes and we’re training him like the basics. But he loves the word NO😂 Atm he’s in a biting frenzy, and when we tell him NO he bites more😂 Although it’s so funny to watch, i actually don’t know what i can do😂 Is anyone else’s dog like this and please how did you stop it?😂