Criticism is an interesting beast. For some of us, it can be received, regardless of tone, and used to learn more about ourselves and work. For most, it can shut us down, belittling the opposing side's opinion, testing their 'experience' in our field of choice, and ultimately leading to a harder stance, often misplaced.

Critique, feedback, reaction to one's work or the way they have presented it, regardless of intention, is a gift.