If an ideology is correct, the communities that spring up around that ideology generally tolerate opposing viewpoints to exist within their spaces.

We see this in atheism... Christianity doesn't tolerate nonbelievers in their midst's, but atheists don't mind when Christians show up.

We see this in the fat acceptance/health at any size movement... The body acceptance people immediately silence those who were once fat, but have become fit, even if there's body acceptance involved, but any fitness community worth its weight welcomes people of all shapes and sizes, and helps them shed the pounds.

We see it with Zionism, where pro-Israelis immediately label all criticism, even legitimate criticism of the policies of the Goverment of Israel, antisemitism.

And we're seeing it with feminism... feminist groups ban and censor dissenting opinions en masse, while men's rights activists have no problem with a feminist walking all up in here and challenging your views. I see it here daily and yet the mods don't stoop to feminism's level.