If you can learn how to handle negative feedback gracefully and skilfully it will stand you in very good stead in lots of circumstances. It sometimes helps to remind yourself that this is just information - nothing more - and that you and only you, have control over whether or not to take it on board and do anything about it. It is often easiest to say "Thanks, that's interesting, I'll give that some thought" or something which doesn't agree OR disagree with the critic. Then take the information away and decide later (in your own time) whether it is useful or not. That way you stay in control of the situation and are never seen as hostile, defensive or any of those equally negative things! Now, you can ignore this or use it - entirely up to you!!!
Best wishes
Saro