Thank you! In this case, he thinks embarrassment is a better means of defusing the attacks than violence, which would get people on the opposite side of the rebellion quite quickly. And he has the magic to ensure that if any serious attack does get started, he can stop it with such methods.

And yes, I think a lot of it is Harry's fault. There's probably even more that's no one's fault (the homophobia of the wizarding society, the dynamics of the relationship between Harry and his friends after Hogwarts), but Harry could have told Ron that he was going to date wizards and Ron had better accept it. He was absolutely terrified of being forced to choose between his friends and his sexuality, though, so he didn't do it.