I'm not saying that rape isn't a problem, even in the US. We all remember Steubenville, I'm sure. However, rape culture is a blanket statement that was adopted to condemn America as a whole in the 1970s and should never be used in a serious discussion in this day and age. It oversimplifies the matter in a way that makes people not even care when they hear it because it's frequently been used by histrionic people who blow things out of proportion. If rape and people's response to it has become an issue somewhere, find a more articulate way to speak against it than by using bumper sticker slogans. The general public does not listen to or care about those. So yes, I'd still say rape culture as a phrase is meaningless at best and harmful at worst. The more obnoxious you are in spreading your message, the more quickly it'll be ignored.
To get back on the subject of Penny Arcade, they actually DID receive well-written, thoughtful responses from some people that made Gabe reconsider his actions. If you actually take the time to put effort into the words you use, you can be a lot more persuasive (or at least respectable) than you would ever be by using arguments like "rape culture" or "socialism" or "gun grabber."
But now I'm veering off into a much bigger issue.