They aren't shouting at men because they are men. Why are you making straw man arguments? We aren't talking about GBH, murder, violent street crime. This thread is about making rape threats to women because they are women.
I've highlighted (ooooh many times now) why sexual/violent threats are espoused. You've not elaborated at all, other than to counter that "it's "because they are women" or that its borne out of misogyny which is over simplistic in the extreme. And much street violence is preceded by verbal abuse borne out of machismo much like cat calling.
Rape threats (unlike cat calls) aren't rooted in machismo because of the difference in motivation. As I said above - "Cat calling is often little more than crude, gratuitous sexual observations said to enhance the macho credentials of the individual in question. Threats of a sexual/violent nature often run contrary to this because they're motivated by the need to intimidate, manipulate, break the will of another or are simply espoused by inadequates desperate for attention (even negative attention)"
Perhaps misogyny does play a part occassionally but to argue its always the driving factor is both oversimplistic and decidedly erroneous.