Cuz apparently anti-feminism is alt-right and can be categorised alongside racism, white nationalism & xenophobia :
“NEW YORK (AP) — Twitter announced Tuesday that it is expanding efforts to protect its users from abuse and harassment, the latest milestone in a broader, growing corporate campaign to crack down on online hate.”
“In July, Twitter banned conservative provocateur Milo Yiannopoulos, an editor of the right-wing news site Breitbart News, for “participating in or inciting targeted abuse of individuals.” Twitter subsequently suspended the accounts of other prominent figureheads of the “alt-right” fringe movement, an amorphous mix of racism, white nationalism, xenophobia and anti-feminism.”