Did you leave the rat in there with him unsupervised? I've been feeding live for years, averaging between 75-100 live rats a month and have never had an injury from feeding.

One obvious problem I see is that you are attempting to feed him too often. I would only attempt feeding him every 5-7 days. As long as he is healthy a couple missed meals won't hurt him. If you feed them everyday it will only reinforce his bad habit.

You say you do not want a pet rat. C'mon... Give them a chance. Most people on here who have had to keep a rat because of a refusal end up loving the little buggers!

And please don't downgrade to mice unless you absolutely have to. He is already established on rats, so that is a good sign and will save you a lot of trouble down the road.