:yeahthat:
I have a cage aggressive bun and its difficult to deal with. She just bit me like 2 weeks ago, and always lunges at me when I put my hands into her cage.
I usually clean her cage and feed her when she is out, so there isn't an issue. Sometimes they're just really protective over their areas, they see your hand as a threat and attack you. But once you get them out of the cage, they're fine. Thats how my bun is, I let her out and she loves me again.
If your cage is up high, put it down on the floor or low enough that your bun can hop out on his own. If he isn't neutered, getting his neutered could help too.