It’s very easy to get caught up and frustrated when your pet seems to be at odds against you, when you’re trying to do your best. It’s good to step back, take a breather, and try and think very clearly about everything that’s happening. You’ve presented a lot of detailed information, which helps with figuring out some good methods to teach your bunny what you find as an OK method of communication, versus not OK. Rabbits don’t really understand punishment, so see it more as figuring out more effective teaching methods, rather than punishing.
Firstly, it’s good to hear that the finger bite occurred because of a mix-up with a bowl. It’s possible your rabbit would not have been so committed to the bite, knowing it was your finger. But like a toilet flushing, once the intent is there, the action follows through, so if he really wanted the bowl, his teeth and jaws were definitely in it for a very pressurized bite. Again, sorry to hear your finger was on the receiving end.
I noticed you mention he bites you “because he knows it hurts me”. This may be true, but I think lots of times, rabbits nip to get attention or try to communicate something. It can be difficult for rabbits to learn the pain tolerance of a human, since we do not give off the same cues as rabbits do, plus we’re huge. He may be perceiving them as nips, while for you, they’re actually painful bites and scratches. This is why I’m hesitant to say your rabbit is a jerk. I think he’s just bad at communicating with you right now. Wick used to bite my pinky toe, but after some time, he learned it was painful and has now stopped. I used the squeal-and-retract method of feedback very consistently, and eventually it caught on to him. I see you’re squealing, but also be sure to retract the body part and yourself away as well, to mimic an animal retreating due to injury.
Rabbits are extremely food-oriented, so it’s not surprising that you’re describing situations around food. Minimizing the chance of this occurring can generally help, because the less instances he has to try and “bite” for food, the less times both you and him are frustrated by what unfolds. So try eating at a table, or not near him, to the best of your ability when possible. Eventually, a lot of rabbits calm down when it’s time for their pellets and veggies (as compared to when they were young) because they have a sense of food security— they don’t need to try their hardest to get food whenever they smell it or sense it, because they know it will be presented to them. Before feeling food security, a rabbit will always go out of its way to get food, because to the rabbit, it doesn’t know when the next time it can eat as. So your rabbit may not just be begging from selfishness or trying to get attention for a bad reason; he may be driven to do so because it’s his survival instinct! Combine this with the fact that he was just neutered, his instinct to go to food may be amplified. Can you adjust that when you eat, that’s when you present him with his pellets?
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.