I’m not so sure. It seems that his detractors were a powerful motivator for him. So, he DID care what they thought or said.

I believe that to overcome our limiting belief of inadequacy and it’s accompanying feeling of shame we need to uncover its source, which is from our early years and continues to lurk in our unconscious mind. This can be accomplished in many ways and usually requires some assistance. Failure to do this keeps the source of our Imposter Syndrome alive and well, wreaking havoc at the most inopportune moments. That’s how it has fun!