I think this is definitely true, but it doesn’t just blanket apply to any joke that mentions these topics. Jokes where people “pretend” to say sexist or abusive ideas, but the joke is that “I’m actually a nice person, I obviously don’t really mean this” (eg “no means yes, and yes means harder, amirite guys ;-)” or “if there’s grass on the wicket, it’s ready for cricket, lol”), can definitely be harmful even if not many that way. It normalises those attitudes, and can make abusers feel like they have more support from society than they really do. But in this comic the character comes across as a psychopath, proudly announcing something that is clearly wrong, and the other one calls the police. I don’t feel like anyone is getting some message that actually it’s totally normal to have sex with ten year olds…