Many people in this world will bring you down no matter what you are trying to achieve. These few unfortunates ones were probably raised badly or grew up in an environment where it was okay to bring others down to compensate for their own failures. You will deal with these kinds of people all your life, and you will realize that it was the taunting and negative comments that ultimately brought about your success. You pushed yourself harder when they criticized your work. You rose above their challenges and you crushed the desires to sink down to their level and fight back.
No one ever created something new without facing the challenges of the old and stubborn minded. Innovators and entrepreneurs face the disapproval of the masses every day and yet they walk the lonely path because they know what lies at the end of the road.
Criticism is something we can avoid easily by saying nothing, doing nothing, and being nothing.