Why so many "anti-feminists" in the atheist community?

[Dystopia]

I am talking about inequality that's systemic and institutionalized. For instance, the fact that men are often given harsher prison sentences for the same crime.

Do you ever wonder why that happens? As a law student I noticed lawyers often ask for mercy to the judge saying that their client is a woman and poses no danger. Men are given harsher sentences simply because they are considered strong and hence dangerous. Women are given less time because they are considered too weak to be dangerous enough and no one believes they will survive in prison. Have you ever wondered if gender roles can give you upsides but impact you negatively at the same time? The though side of being considered "Strong, assertive and masculine" is that you are also considered more dangerous than people with feminine characteristics who are seen as "passive, submissive and docile".

But you can't have it both ways, either feminism is equality for everyone (which some feminists love to claim) or it's entirely focused on women's rights. Either is fine, but if you are in the former group, you need to focus on issues which effect equality for everyone. That is why egalitarianism exists.

False dichotomy. It can perfectly be mostly about women but also take some time to focus on men, gays, transsexuals (as it does nowadays). You don't dictate that it's either one extreme or the other. It's like saying that you are either a fundie Christian or you are an atheist. You can be something in between.

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I don't think anyone here is sexist like right wing religious nuts. But sexism towards men DOES exist. Ever see that God Bond spot with Shack "Man up". That perpetuates the stereotype that men are supposed to be tough, and never fail or be supported by women.

I agree, but have you wondered why the "man up" exists? It is because there is a spectrum of feminine and masculine and while you get perks for being masculine you also have the hardship of maning up and facing though situations. People tell men to man up because they assume they are strong and can handle it. They don't tell women to man up because women need help and support.

The only beef I have with feminists is while they rightfully tell men they have no right to control their bodies or have the right to tell them what to wear as adults, many of them turn around and tell women not to wear tight cloths or never show their naked bodies to men. 

Where the hell have you heard them telling women that? IT's quite the opposite. You can't promote slut shaming based on clothes. Modesty is not a thing unless you happen to personally like it.