I think he’s teaching the kitten some boundaries, which is probably good in the long run. He learned from his past experience that cats can sometimes try to get him, so I think his behavior makes sense.
As the kitten gets older, he will probably learn to give Appa his space, and Appa will learn that he doesn’t need to be so defensive. But then again, maybe as the cat grows he will be more aggressive towards Appa, so it’s prob good that Appa is setting himself up as the boss. I think for now supervising makes sense. I wouldn’t try to put them together intentionally, but if they happen to be in the same room, supervising the interaction to make sure it doesn’t get out of hand is a good idea. My cat and bunnies are pretty relaxed together, but will never be friends exactly.
I definitely wouldn’t let the cat continue to try to mess with him since it is scaring him so much.
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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.