I agree, to a certain extent. Since history began, in almost every culture, men have owned and oppressed women at a structural level. Men have always been seen as fully rational human beings, while women are...not, even by other women.
So while internet porn is damaging and unhelpful, before videoed or photographed porn - when drawings were all that was possible - women were still seen as objects there for men's usage, whether that be menial, sexual, or otherwise.
What internet porn has done is create wilder extremes of what is done to women, normalising sadism and refining degradation to a disgusting art form.
Expectations of what women should be willing to do sexually is far more extreme, and society is grooming women to want that for themselves too - masochistic and Stockholm syndromed (figuratively speaking). I do think that's a big part of why so many teens, particularly girls, are 'asexual' these days; the sexual landscape is a frightening, disturbing place that they don't want to go to.
Internet porn affects boys and girls from a young age, and it has shaped and warped the society around them, so that even if they don't personally view it (accidentally, out of curiosity, or because a peer showed them) they live in a world that's shaped by it. It makes boys see women and girls as highly sexualised objects, even more so than they used to, and makes them want to do ever more sadist things.
The internet also allows sexual offenders to find each other so easily, when otherwise they might be isolated and more fearful. They gain in confidence, they swap tips, and they hunt in packs, egging each other on. They also, I imagine, groom bitter, lonely boys into becoming active offenders, and reassure each other that their behaviour is normal and justified.
The internet creates a mob mentality - the sort you might see amongst soldiers in war, who seem to be totally normal, law-abiding men before going away to war, and who end up raping civilian women and children in packs.