Perhaps instead of making sweeping, sexist generalisations about 4 billion people on earth, we could apply some brainpower?
Most people who post on Mumsnet are women. Most people in general are attracted to the opposite sex. Therefore, most of the people who post on Mumsnet are women who have romantic relationships and families with men.
People post on MN about various problems in the hopes of getting advice from other users. If things are going well, they have no reason to post. Popular post topics include dating, romantic relationships, domestic abuse, parenting and running of the household.
If most posters are women who are interested in men, and many posts are about relationship and family problems, then a disproportionate number of posts will involve dysfunctional relationships with male partners.
If you went to a similar forum where the majority of posters were lesbians and straight men, the dysfunctional relationships would involve female partners - would you then conclude that "all women" are shit partners?
Some MN topics do not involve romantic relationships. They involve things like bitchy mums at the school gate, crap female friends, drama-filled all-female friendship groups, and difficult MILs. I see far fewer posts about bitchy dad groups, crap male friends, drama-filled male friendship groups or difficult FILs. What does that mean? Should I assume all mums, female friends and female colleagues are shit? Should I make a thread about such assumptions? Or should I recognise that the sample is biased and that there are plenty of decent women in the world?
The same people who make frothing-at-the-mouth posts about "all men" would be out for blood if they saw similar posts from men about "all women". The hypocrisy is unreal.