But feminism as a whole, as I think of it, is about advancing the rights of both sexes.

I disagree. Feminism is almost entirely about advancing the rights of women. This is not inherently a bad thing. Making sure women have the same legal rights as men is important. Addressing social issues that women face is also important. But feminism doesn't directly do anything for men. What major feminist initiatives have there been addressing female privileges or issues where men are primarily disadvantaged? But that's ok. That's not feminism's purpose. It just needs to keep plugging away at its goal. It is when it gets in the way of men having their issues addressed, devolves into misandry, or oversteps with intersectionality that it becomes toxic.

Unfortunately that is where modern mainstream feminism has gone. Feminists with a capital 'F' have taken the idea of gender equality and put it all through the lens of their ideology. It's like fundamentalist Christians. You must agree with every point in the exact right way or your a bigoted misogynist. How dare you consider yourself an egalitarian. You can't be a MRA and a feminist. That sort of nonsense.