I'm married to the nicest person I've ever met. He's not remotely sexist - he isn't any ist at all, actually, he takes people as he finds them. That doesn't mean sexism isn't rampant or that women are very unequal in our society, why should it?
Women are under-represented at every level - politics, civil service, major corporations. They're over represented in areas that attract relatively low pay and status - childcare. nursing, cleaning, teaching. Women are paid less for work of the same value, and I could link to a dozen studies and court cases that illustrate that. Women are victims of domestic and sexual violence massively more often than men. Women are subject to nasty, vindictive spite on grounds of gender in a way men just aren't. Men are attacked on all kinds of grounds, absolutely, but not their gender itself. And the worst insult levelled at another man is that he is in some way feminine - whereas the worst insult leveled at a woman is that she is ugly, sexually a turnoff, and deserves to be raped.
That isn't a theory. It's, you know - factual. How is saying as much unacceptable special pleading? I'm white, but I pointed out when I thought people in another thread were being racist, too - another form of prejudice that should be undeniable to anyone with an ounce of grey matter. I don't like homophobia, either. I don't like it when anyone or any group is treated as less than human for an inherent trait that in no way affects their worth as a person. And that's all sexism is.
I genuinely don't understand why or how anyone can find that strange or controversial.
For the record, I think the family courts are disturbingly unfair to fathers whose exes want to block them from the kids' lives, and it isn't taken seriously enough as the abuse it is of the kids as well as the father. I think that is a genuine, thankfully statistically rare, case of sexism against fathers, and it's troubling. I've said so on many threads here over the years. It's just that sexism against men, in the scary, life-altering sense, is usually rare and generally quite trivial. Men have more power in our society - in every society, in fact. Attitudes towards men and women's sexuality is completely different. And I am baffled by the double-think and mental gymnastics required when people try to deny it. It's not like there's no evidence, is there?