One of my DH's friends started lactating due to a condition and wasn't at all pleased when the doctor reassured him it was safe for any potential babies to drink!
Absolute utter and obvious lies. Your DH's friend may have said this but he was lying. There is no way a medical doctor would ever say a man's milk was safe to drink due to the fact they cannot possibly know and it would be against medical ethics to say something so blatantly false.
Making up a lie like this shows a staggering lack of knowledge of the standard GP / doctor line about breastfeeding. Firstly as PP have said a man who starts lactating has an. underlying medical condition - you clearly don't understand that many XX women who have underlying medical conditions can't breastfeed due to the risks to the baby.
Secondly, women are routinely told to stop breastfeeding and switch to formula because fairly standard drugs WHICH ARE ACTUALLY USED IN NEWBORNS don't have robust studies on how much passes into breastmilk. If you look at Hale's work on medicines and mother's milk lots of drugs just don't have the data. I was told to stop breastfeeding and switch to formula for a week because I was taking an antibiotic that is actually given directly to newborns who have infections once. Doctors are INCREDIBLY risk averse when it comes to infant health. If they don't know they won't advise anything.
Just simply didn't happen.
Maybe it was a doctor of philosophy?!!!