There have been a few studies. Most estimates put it at around 20% of men engage in actively degrading behaviour, sexual harassment, or have had a history of sexual assault, with between 5-8% actually engaging in violence. It isn’t everyone, but it is around 1 in 5 which is not a small group that could be classified as “Creeps.” It’s a lot higher percentage of the population than, for example, the percentage of violent extremists among Muslims.