It's absolutely a misogyny issue. Even the men he hated, he hated because they had women that he thought he deserved. Everything about it stems from deep-rooted misogyny that was only amplified by depression, social anxiety and a great deal of entitlement. Asperger's, narcissism, depression and social anxiety are not causes of violence targeted towards women, misogyny is. The guy had a manifesto detailing how he wanted to put all women into concentration camps and watch them starve to death, how he wanted to boil them alive for not smiling at him, and it resulted in him driving to a sorority house to kill the women that lived there. Blaming mental illness and developmental disorders is insulting to the millions of people that live with them every day. I said it earlier in the thread, not all mentally ill people are misogynistic killers, and not all misogynistic killers are mentally ill, the common denominator is misogyny.
His hatred of women also extended further than his desire for revenge against the women that he perceived to have rejected him. In his manifesto he expresses resentment towards his father for allowing his step-mother, what he deemed, too much power, and saw himself as above her. He even supposes that the only reason his father was with her was because she was good in bed. He was appalled at being insulted by a girl in summer school. He begged on multiple occasions for his mother to marry a wealthy man to make his life easier. He explicitly states that he felt entitled to a girlfriend and sexual encounters.
Yes he hated men as well, but he only hated them because he believed that they'd denied him the women that he thought he deserved. Whilst his mental state was clearly a contributing factor, it is undeniable that this was a product of misogynist beliefs.