I had to Google "man-o-sphere". Is it particularly more dangerous or toxic than other identity-based activist communities? Genuinely curious to know

Yes, a lot of it involves denigrating women and an entitled and very rigid attitude towards the male place in society (alphas etc).

This is incredibly toxic for young men growing up and the women they interact with.

Some of the more prominent proponents are actual pimps (the Tate brothers).