Well, it won’t stop. We will just have to keep laughing at it, since the brainwashing won’t work. Maybe then it will stop when we have laughed it off, confront it when it crosses the line (like teaching it in a classroom) and can afterwards settle on ignoring it.
Another option is to burn it down and make them choke on it. Push them even farther out and off the silly ledge. Example; Pretty soon we won’t be able to maintain validity of any archeology findings. “We can’t make any further assumptions, because we don’t know if these are the bones of an actual male; maybe this ancient hunter identified as a woman!”