what the manosphere is

Literally coined by one person who wanted to lump all men's spaces online together to sell a book. Later used to equate the worst incel, PUA, and redpill spaces with people who oppose circumcision, separated fathers who want to see their kids more, people who call out law or policy that's biased against men either explicitly or in practice, etc in order to use the former to spite the latter by putting them in the same box.

You know, basically the thing that if you try to do with women's groups you get responded to with "feminism is not a monolith."