Anyone who’s grown up in a patriarchal society has been socialized with those values so anyone (regardless of gender) can perpetuate sexism. However, an oppressed group can’t oppress their own group. They can internalize negative values about their own group but since they don’t have social power like the dominant group they cannot be oppressive, just prejudiced. For example, people of color can hold prejudice against other people of color but they can’t oppress them in the way that white people can. But yes let’s worry about how men are so persecuted.