Unlike statements that are derogatory, a non-derogatory but potentially harmful statement can be made about a person if it is clear that he does not object.

If someone regularly talks about his inability to remember even his own phone number, it would not be forbidden for others to repeat that statement, provided that neither the speaker nor the listener thinks any less of the person on account of his poor memory.

Certainly, if a person explicitly grants permission for others to disclose potentially harmful information about himself, they are permitted to do so provided that the information is not derogatory.

Sefer Chofetz Chaim, 23 Tishrei, page 94

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