Why is this ok?

If a woman makes a group and is "Empowering women" it is OK to exclude men. If men want to have their own group and they don't include women they are called sexist and treated like criminals why? Now I know somebody is going to act out once they read this. I am going to tell you upfront if you are rude disrespectful or simply trying to bully people that disagree with you. I will block you quickly. Don't challenge my manhood or try to attack me as a person. It is just a question.