"How do I react to criticism?"
Well, if you are junior, first acknowledge that you still have a lot to learn. "Criticism" is a way to improve so you don't take it personal. Try to find out what you did wrong and try to improve.
If you fundamentally disagree, voice your disagreement in a diplomatic way and mention the reasons for your disagreement.
"A criticism should not be the end, but the start of a dialogue."
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Luke
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