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I half agree with you, It is important to be able to take criticism and not have a retarded ego.
I don't think you need to be grateful for every opinion. Because you cant please everyone.
It is important to to have confidence in your work. You can't please everyone, there will always be hoards of people ready to tell you why something "does not look right".
Everyone has has a different opinion, and the ones that hate are usually the loudest.