Let's not restrict our concern to only "sexism against women (or queer folks)". It happens to men too, and men get far less support.

Harassment of men in sexual ways is less reported or taken less seriously, in part, because the culture of sexism against women reinforces that male victims of the practice are somehow lesser.

Also, plenty of sex-stereotyping that rises to the level of an "ism" is generally positive for men ("big strong man help me move this <heavy object>" or "big virile man you have a beautiful wife"--a doubly sexist trope--and so on).

So while I agree we shouldn't reserve concern only for women, we must also not present the issue as though it is somehow equivalent or equally applied.

The fact is that sexism against women is far and away the majority case. We shouldn't choose to address one concern over the other if they were equivalent, but in this case focusing efforts on combating sexism against women will also work to reduce sexism against men naturally. So it's a win-win to focus on and prioritize combating sexism against women.

Honestly we have no idea how widespread the problem is for men.

Most men who are victims of sexual harassment, domestic violence, and other forms of sexism don't speak out.

in certain fields men just have a bigger "in group"

That's true, certainly in engineering, which is the main concern of Hacker News.

In other fields women are more powerful (than in engineering).

I was personally harassed twice by female doctors. Never reported it because honestly, what's the point?

equality IS here, now it's when someone that isn't in the "in group" tries to get ahead it's different.