As a man, I can understand how Tazune became the way he is. I experienced a couple similar instances when I was a teenager. That does not, however, excuse the person he has become in the slightest. I've never abused a woman in my life, and if I met the women who bullied me again, I would have no problem treating them like it had never happened. This is because I understand that being a teenager is like someone pumping you full of drugs that make you a complete asshole just for fun. I don't blame them for how they acted, and I don't even want or expect an apology. I'm sure they regret lots of things from their teenage years.
Unfortunately, Tazune, as well as tons of other misogynistic assholes and incels, see their teenage years as something for which to get revenge. It's a huge problem in our current society, and the author's done a good job in portraying how vulnerable and damaged women are targeted by these people. I can only hope Midori finally comes to her senses and chooses the love she should have had so long ago.