She's not saying that slash IS automatically anti-feminist. She's saying that a lot of the reasons people give for being slashers and the way that they write slash CAN be anti-feminist, which I have found unfortunately to be true.

I cannot tell you the times I have talked to slashers and come away with the opinion that they have issues with women in general and being women themselves. It's gotten to the point where if I find out someone is a slasher, I ASSUME they have issues with women until proven otherwise.