Getting angry now...

So I had just written a post about giving up on ever getting my rat William to stop biting me, and was going into it refreshed and ready to work on him some more, but now I'm really freakin angry. He bit me three times today, and I didn't even attempt to hold him or pet him today. He bit me while I was playing with the other rats, putting food in the cage, and spot cleaning. God, I am just so sick of this. The last bite drew a bit of blood, and it took all my will power not to scream at him. He's just getting worse as time goes on, it's like he knows he can get away with being a bit freaking A-Hole, so he does whatever he wants to me. Seriously, I don't want to give him back to the rescue, but it's getting to the point where I can't even enjoy my other rats because he'll run up and bite me every time I touch one of his cagemates. GRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR :evil: