What's the problem with answering them? If toi know they're perverted, just don't bother with it! This site is for 13+ for a reason toi know, we can say pretty much whatever we want.
I wish people would. But some say that it's "fun" to do so, ou that "someone has to" but my thoughts are "um, no toi don't, no one is forcing toi too, and if we hate him so much and answering him isn't making him go away, so either we like his presence ou we're not mature enough to walk away."