There are multiple pieces to this:
1. What is Misogyny?
2.Why are some men misogynists while others are not?
1. A man who cannot or will not respect a woman's humanity is a misogynist. He does not see women as people. He sees them as concepts as ideas. A misogynist already has his mind made up before he talks to a woman. He has already decided that he wants her to have sex with him and just do whatever he asks her to do. He feels entitled to respect and to servitude based off the fact that he is a man. He believes that as a man he ought to have more advantages because he is naturally better. Being a man entitles him to more opportunity and more power. Not unlike some misandrists who see men as nothing more than a source of money and sex. The common thread is a devaluing of the person's humanity.
2.Some men are misogynists because they are not aware that their behaviour or thoughts are considered misogyny. They were raised to think of women a certain way and then have acted accordingly. They have gotten their messages from movies, music, TV, books, people in real life, etc. Other men are misogynists because of experience.
Consistent rejection over what they perceive to be asinine reasons ("he asked me if he could kiss me, ew so weird" "he was too nice to me. That's just gross and unnatural. I had to dump him") can turn men into misogynists. If in their experience, they have tried to be respectful to women and have only received complaints and rejections, the natural course of action for them is to shift into the other direction and give them no respect because experiences have taught them that women don't want that. Whether or not they have just been unlucky and have been around women that don't know what they want/are more used to being mistreated because that is what is natural for them is irrelevant. A man that has been hurt won't see it like that. He'll think there is something wrong with women in general and approach them with a general perspective instead of trying to tailor his approach to women on an individual basis.
Most men have some level of disrespect/hate for women in them, just like most women do for men. It's a matter of finding the right person who can change your perspective. That's why people continue to date in spite of that little bit of mistrust/dislike.