I personally LOVE criticism -- positive or negative. Why? Because I know I'm not perfect, not even close. None of us are, no matter how perfect we seem on the outside. When someone gives you criticism, it should excite you and motivate you. Think of it this way... they are giving you direct feedback on what you could do yo improve or be better. Why not use that to improve yourself? I think it's far worse if someone has some criticism but doesn't share it and keeps it to themselves. Because then you have no clue how you can be a better version of YOU, and they are doing a disservice by hiding it from you.
Think of criticism as an opportunity to become a better version of yourself -- and who doesn't want that? ;)