It's designed to desensitize what Harvey did. Once it's revealed that tons of people all over social media have been a victim to sexual assault, what Harvey is accused of doesn't seem as bad. It also makes people think of #metoo instead of the allegations against him.
Honestly this campaign could end up being an ingenious, back-handed way for Weinstein (and Hollywood) to deflect guilt, by implicating the entirety of manhood as being accountable for his crimes.
People are talking less and less about Weinstein and Hollywood, and more and more about men being sexual predators.
If being a sexual predator is normalized as the expected pattern of collective behaviour for a male, there is less individual guilt to derive from it, for a Harvey Weinstein. He will just be seen as a "powerful, oppressive male" doing what powerful, oppressive males do, instead of a heinous criminal.
The reality is that Harvey was a sex-addicted freak abusing his position, who represents no more than a minimal portion of deranged, perverted males. His actions should not be generalized to represent that of the normal behaviour for a collective group, no more than the actions of a mother who drowns her children in a bath tub should reflect on womanhood.
Really, the media are just setting the standard that we should, for example, condemn the entirety of Muslims based on the actions of a lone terrorist. If the actions of one, sick freak are enough to launch a campaign to condemn males, why shouldn't we likewise use the actions of one, sick terrorist to condemn Islam and its teachings?