Pruni, but you don't have to disregard things. You can choose to listen and take things on board.
The point of saying this is to make you realise you have power. You are not a little beach ball bounced around on the waves of other people's approval. Yes, we are social creatures by nature, so of course we have strong emotional reactions to things that are said to us. But we can, if we choose to, take a step back and say, 'wow, that was a hurtful and unkind thing to say. But really, it is more about them than me.'
It might take some time and effort on our part to truly believe this, but it can only benefit you. It isn't for anyone else's benefit.