This one is way more zealous than the other one, refer to the other comment for an explanation of the connection.

It isn't that it's mean, you dummy, it's that the underlying values of this joke are in fact fascist in their orientation and, because people like you exist, it is an effective way to promote those values. If you need an example, think of the jokes about these people that reference inbreeding with the presumption that it is correlated with poor intellectual and cognitive ability, and therefore validates the idea that these moral qualities are related to genetic qualities (there is also a classist element in this joke given where they are oriented in the US geographically). Even if there is science to suggest that this is potentially a real consequence of inbreeding, I hope I don't have to explain even more clearly to you why it is problematic to naturalize the correlation between genetics and the danger one group poses to society at large.

You've tried to lecture me on language, but you don't seem to know what any of these words mean, which is why you are so vulnerable to the manipulation that they promote. You think every fascist is just what, dumber than you? You don't think that maybe there's a way to "trick" you into subscribing to the same values they do, especially if you already subscribe to liberalism wholeheartedly as what appears to be the case here? You don't get to choose the consequences of your actions, you can only inform yourself so that you can make better decisions in the future. If the effect of this joke is that it reproduces the idea that there are physical markers for moral depravity, then you either have to admit that you want it to have that function or change the way you understand these terms and the context they exist in. Some fascists choose to be fascists, most of them just don't think about it.