Someone with a critical eye isn't going to be shy about dishing out their criticism of you, but you need to try not to get defensive about it! Hear them out. There is value in what they have to say. Your reputation is your top concern right now, so if they have some ideas on how to improve it, you need to hear it. Feelings don't matter when real knowledge is out there to be had. You can't sacrifice such valuable insight just for the sake of your slightly sensitive ego.