This would be a fruitful discussion to have with him. You don't know for sure what he is thinking or feeling but you are attributing a particular reaction i.e. that he doesn't like your art.

Clearly, he is not 'getting' what you are trying to show/tell him through your art.

I would tell him how you feel as this is clearly affecting you. Can you tell him next time you see him that you feel lonely, misunderstood + feeling he doesn't like what you do. Not in an accusatory way but being honest with your truth.