This is extremely reductionist as it's actually a fairly complex school of thought, but it's essentially just: everyone is equal and thus should have equal rights and treatment under the law. A basic example:
I have a cake and take it to a party with 7 others. We agree everyone should have equal right and access to the cake and so cut it into 8 equal slices.
Where as Capitalism is like: I decide because I came up with the idea of getting cake, I deserve more of it, so I take 50%. The host of the party gets a 20% cut. And the remaining 6 guests divvy the remaining 30% amongst themselves.
Just FYI, because it seems like you want a trans-exclusionary sub, this is not the one for you. Sidebar rules state the belief here is that trans women are women, and as OP pointed out, the misogyny you describe is often a result of gender perception rather than chromosomal makeup.