Never become weak just because of constructive criticism, but you should think of it as something positive. You can judge criticism and insults basically easily, not too difficult but don't be offended if you are in discussion forum like bitcointalk because we don't have to be the same forever.

Remember, not everyone agrees with what we say because here you and I and others may have different opinions, they will criticize it but we should not be sensitive especially if it is constructive. It's actually quite simple, you shouldn't argue with someone who keeps insulting you directly but just ignores them for good. But take the positive side of constructive criticism.