As anyone ever seen their snake do that?

[SpOoKy]

Try covering the sides and back with some newspaper or something. He may not be feeling secure enough to want to take the risk of striking. Especially if you just cleaned the cage. Most his smells are gone, he may be wanting to figure out what happened inside his home. Wait a week before offering the food again. this will give him plenty of time to sort out his new surroundings.