If you mean can you block a spell, then yes, you can. Spells are merely the manipulation of energy. So, if you think someone has placed a spell on you, you can perform a counterspell which should cancel out the original and return it to the person who cast it.
If you mean can you add a dose of hatred to a spell, then yes, you can do that as well. I would advise against it because, as I mentioned above, it can return to you with additional force...and you wouldn't want that.