Well that's where our differences lie. I probably find them equally as distasteful as you, but I don't think a lot of them are encouraging people to actually commit the act of rape and assault.
That's because (hopefully) if you find them distasteful you're not the sort of person who thinks violence against women is awesome. The thing is, there are people out there who do think it is awesome. They tend to have a very different response to these sorts of "jokes" and imagery.
There have been some studies that indicate these sorts of jokes may increase negative behaviors towards women, such as victim blaming. This is troubling because even if these jokes don't inspire someone to rape or assault someone, they may encourage them to act in a way that enables others to get away with doing so.