It starts by not taking the work itself personally. Then any criticism of it is not personal either. You are not the result of your craft. You are the craftsman doing your best in a given environment, under certain conditions, in a given scenario.

Life is complicated. You are not omnipotent. These are very basic absolute truths.

You need to actively recognise this, and make it a part of your core mentality, and mentality drives the sentiment. Sentiments drive emotions. Emotions control how you react.