This is a fred about lots of freds.
I've been on plenty of forums but never found one where people love to diagnose quite as much as they do on here!
Random diagnoses pop up on threads where it is not asked for and usually not welcome or even relevant. Sometimes, the armchair diagnosis is just a poorly understood stereotype of the condition/illness.
If a person posts saying they are down and feel resentful their baby, it's one thing to say; "I felt like that, went to the GP and got support for PND, maybe it's something you could explore with your GP?" and quite another to respond to a post asking "my husband hits me, how do I leave him?" with "he sounds like he has a narcissistic personality".
Just to clarify, I am not against supporting and encouraging people to get a professional diagnosis but I do hate the pointless armchair pontificating.