I think you may underestimate how much human nature is more towards kindness and generosity. I think a lot of us have negative experiences in childhood and similar younger stages, and it causes us to be less kind, less generous as a sort of defense mechanism. When you realize that the defense mechanism isn't actually necessary, you realize there is more space for kindness, and maybe that is actually your authentic self beneath.

Just pretend that you are being yourself. This should satisfy the person above as long as he does not find out.