What TheOddity said ^^
I start from a 50-50 might be a troll, might just be new to mumsnet stance (there are people for whom "Hello Ladies" is simply a polite greeting).
I tend to go cautiously. There was one earlier today from a woman who, as the thread unfolded, came across as genuine and honestly wanting helpful advice. Would have been really crap to reply with "We don't call each other ladies here, hun".
Exception being FWR - if someone starts a thread there with Dear Ladies they are guaranteed to be a troll.