I stopped when I realised my online activities had offline consequences. I had absorbed so many horror stories, I was starting to view all men as potential abusers. I would find myself watching male friends, and my girlfriends’ husbands, scanning their behaviour for tells. If a man ever approached me, I’d assume he was a predator, attracted to my porous boundaries.
Genuinely, I think there is something wrong with this person, if this is accurate. I've been on MN for years and can now spot red flags in behaviour, but it hasn't changed my default assumptions or made me envisage problems in people that don't actually exist.
I think there is a large number of people whose general assessment of risk is hugely coloured by what they've read or seen (or experienced) recently - that's quite natural but it should be recognised. MN has definitely changed my perspective, but I was a bit naive about some things before, and thought e.g. my friend's partner was just an idiot rather than displaying a classic checklist of narcissistic traits.
Also, there is a lot of projection on MN, lots of men predicted to follow "the script" etc whereas the reality is likely more complex than "red flag, abuser, ltb get your free hour with the solicitor".