The people who mock don't do it out of 'ego' they do it out of fear of the unknown, or jealousy because they can't do it themselves.
I agree with you, Pete that the mocking does stem originally from fear. To take it another step, I believe that the ego forms as a defense mechanism to protect one from the pain of fear. Jealousy to me appears to be the fear of ego-damage, i.e., a fear of loss in one's social identites. At any rate, I enjoyed your post and I think it enriched my original thread post quite a bit.