Always receive it graciously and always re-assess your work.
It may be that the critic has found something you need to work on, either in the art and creativity, the technical aspects, or the communication arena.
Either make an adjustment based on what you found in your assessment
or decide that the critic was in error and your writing is exactly as you desired.
Never give up or quit.
If you know that you should be a writer, then no amount of criticism of your work will dissuade you. Criticism is meant to help you become a better writer. It is never meant to discourage a writer from writing. Keep working on it!