Someone with a critical eye isn't going to be shy about dishing their criticisms of you today, but you need to try to not 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 cannot sacrifice such valuable insight just for the sake of your slightly sensitive ego.