Here we should draw a distinction between criticism and attack on character. Criticism is an objective remark aimed at pointing our an error. Attack on character is an expression of personal disapproval.
We all are more likely to suffer more from disapproval from a friend than from a stranger. However, Feelers tend to be unable to avoid confusing diapproval from criticism when it comes from a stranger. When it comes from a friend, they'd be able to see that it truly is a criticism as opposed to an attack on character, despite that it feels initially like an attack on character. Moreover, in that case they would be more likely to tend to think that it was a criticism rather than an attack on character because they expect that the friend has their best interests in mind. Therefore he/she would be more likely to point out errors for the Feeler's own good, as opposed to take shots at them. For the reason they'd be more open to critical comments from 'friends' than non-friends because they deem for them to be less likely to be attacks on character. If it comes from a stranger, they likely will go with the initial feeling that it was a disapproval and treat the act as such.