This weird attitude, as expressed in the OP, is a great example of a syllogism:
Sometimes, groups of men get together to plan harmful actions and behaviours, often targeted at hurting women.
Therefore, no males should ever be allowed to arrange to meet together in groups as this will then prevent all oppression and abuse of females.
Here's another one:
Some people who identify as Muslims commit horrendous terrorist atrocities and kill and devastate sometimes thousands of innocent people.
Therefore, we need to ban anybody from being a Muslim. This is a measured response and will guarantee perfect peace and security among humankind.
One final one:
People with the surnames Sutcliffe, West, Brady, Hindley, Bundy, Shipman and Allitt have been found guilty of the killings of multiple people.
Therefore, we need to force anybody else with these surnames to change their names immediately. This will be guaranteed to severely reduce any future risk of serial killings.
Pearl-clutchers often like syllogisms as it's much simpler than taking the time to think things through logically.