These people - and these blogs - are a bit extreme in what they're saying, but their analysis of the current situation seems exactly what I've found.
At least where I live, women have more legal rights than men, and that's before the near-universal theme of government agencies siding with mothers even if fathers are responsible and mothers are irresponsible and mentally unstable. General rule: if you're a man, and you were previously in a marriage, you will be legally required to pay for your children, but you will have to negotiate any opportunity to meet them. If you're a woman, you will usually get the children and the man's money.
Sexism seems to be alright, and even government-endorsed (educational facilities were, at one point, encouraged to offer special courses for women and allowed to refuse men), when it's against men.
It's not even funny anymore. The militant, unshaved lesbian jokes have worn out, and we're still being subjected to their policies. It's just pathetic.
And then there's role patterns. While women are given more rights than men, men are still expected to be responsible and helpful.
If I don't keep a door open for a woman walking behind me, I'm sometimes criticised for that.
Suicide rates among men are, apparently, four times as high as under women, but charity money (and, indirectly, government money) is spent on anti-suicide campaigns for young women specifically.
If anything, ultrafeminism is turning me into what they'd call a misogynist.
I agree with masculism, generally, in what it says.