I personally theorize BBS's, which got popular in the mid 1980s, and later the Internet, gave spiteful and poorly socialized men a anonymous veil. Reddit keeps the legacy of woman-hostility alive and well with comments like "tits or gtfo".
Well, women chose to get the fuck out. The hostile behavior experienced online would never be tolerated in a face to face setting.
Of course it's only a theory and I was too young to remember any first hand experience of the 1980s.