Sorry to hear that. Chalk it up and move on without any hard feeling. Don't bother to analyze it if he hadn't given you a reason.
Having said that, sailing a boat across the pond in the tight quarter is not a small task. Age, personality, education level, personal habit, skills and etc are all important. He does not like you to sail with him, it does not mean you are a bad person.
Just find another captain, and keep on leaning. Good luck.
I am old school. Integrity is to do the right thing even when no one is watching.