Can you nope a draw exploding kittens?

NOPE! You can also play a Nope on another Nope to negate it and create a Yup, and so on. Stop any action except for an Exploding Kitten or a Defuse card.

Can you Nope someone from drawing a card?

Nope cards neutralize any cards beneath them, so it would be like the Attack card was never played in the first place. Skip 4 cards Immediately end your turn without drawing a card.