There are systemic harms that men experience, it's not just individual. Men tend to be more emotionally repressed because they are told to be, live shorter lives due to higher stress levels and being systemically discouraged from reporting health issues, and are often denied benefits women are given, such as family leave.

However, this is not a separate thing from misogyny as most "men's rights activists" pretend. Rather, it is a consequence of the same patriarchal system that creates misogyny, and arguably harms women to a much greater extent. The harm is created by the expectation that men, not women, be the leaders and primary breadwinners of the nuclear family, and exploit women rather than treat them as equals, so if men want to address this systemic prejudice, they ought to work with feminists and queers in uprooting the patriarchal system of gender.

Judging by the replies to other comments, you seem to be aware of this and your post was just worded in a way that was easy to misinterpret. So I think we agree, for the most part.

(It is 2AM, this is a little incoherent)

This is more so me presenting a different argument but not disagreeing with your point since I feel like it's important to point out. Sexism can be experienced by anyone, but primarily women and girls. But things like this comes in a sort of double edged sword? Men who don't fit gender stereotypes and roles are affected by this.

An example I can't think at the top of my head is the whole "men can't show feelings/be weak". This is sexism towards men, but it can fueled by the idea of "being weak is for women".

Another one I can think of is the belief that men are inherently... Sexual, I guess? More prone and "allowed" to be horny and stuff, which has been used against men before when being sexually harassed but that's another conversation. This can also be contrasted with how women are usually seen as "pure", "innocent", and "weak".

Sexism affects everyone that doesn't follow the gender roles set by the patriarchy negatively. It results in prejudice.