Yes, it makes perfect sense and I totally agree with what you say. This has happened because porn has become normalised in our culture. The result is all manner of bad effects caused to girls, too numerous to discuss here. I haven't read the thread you linked to, but I have seen others like it and they are, as you say, very depressing.
I hope the following isn't mansplaining (I'm male: I like toad in the hole and cook it a lot).
The viewpoint I come from is that the average boy wants to know how to get on with people around him, and that includes girls as well as other boys. I don't mean to suggest by this that anyone is perfect or that there aren't people who will just turn out bad, but by and large we all want functional rather than dysfunctional relationships, and the same is true of boys. Porn, of course, gets in the way of this just at the stage that boys' relationships with girls changes due to puberty. If it causes a boy (who will of course grow into a man) that's bad for him, and it is also bad for women too. The fact that the boy does not realise that porn's bad news for him does not change this.
At school I was short and scrawny and never felt terribly masculine. I always got on well with girls (not that I dated many, but I have managed to marry) and even now have many close female friends. I remember how derogatory boys could be about girls and, more recently, how men can be about women, but I there's always been a voice in me that says but it doesn't have to be this way.