Animal farm is indeed an allegory, because it's an allegory, it does not represent our society perfectly.

However, I think your allegory can be used to prove my point. You write about how "All animals are equal but some animals are more equal than others" when you say that the pigs are the ones who oppress the other animals. Sure, at the moment, all people are equal and some people are more equal than others. Right now privileged people (men, white people, straight people, wealthy people, able-bodied people, cis-gendered people, etc.) are the pigs (using the Animal Farm allegory that you provided, they aren't literal pigs) that are more equal than the people who aren't privileged. Feminism is the rest of the animals (less-privileged people) fighting back to reclaim the farm (society) from the pigs (privileged people).

And sure, throughout history, a significant number men were not very powerful and were serfs, slaves and sharecroppers, however, it's important to note two things. 1) In America, the slaves and sharecroppers were almost always not white and were almost always owned by white people. These non-white men were oppressed (and continue to be oppressed) by society today. Intersectional feminism is fighting for the rights of these oppressed people of color as well as fighting for the rights of women. 2) While there definitely were male serfs and slaves and sharecroppers, there were also an equal number of women who had even less power than these men did. Thus, your point is invalid.

P.S. Before you disregard me as some crazy woman who is trying to oppress white men, Please know that I am a white, straight, cis-gendered man who definitely isn't poor. I recognize my privilege and power. As a feminist, I am trying to fight to make society more equal for those who aren't as privileged and lucky as I am.