For crying out loud… I thought that “Now, clearly this is intended to be offensive and not something that I genuinely believe…” (emphasis added) would be sufficient to avoid this. Likewise in another response where I am asked: “You don’t see a difference in authoritarianism [between this British behavior and that of the Nazis?]”, clearly I do.
The joke – regardless of whether it is to your liking – uses the ingredient of the high degree of pride many British still take in (rightfully) standing up against the Third Reich and defending liberal values; contrasts this using a massively exaggerated satirical equivalence to the failure to stand up for what I believe to be those very same values in the present day. As another poster pointed out, the fact that this is an obvious exaggeration is precisely why it is a joke and not an attempt at a political essay.
I am reminded of how at the end of Stewart Lee’s wonderful satirising critique of the culture of the TV show Top Gear, where he faces the camera and explains that, no, he in fact does not wish that Richard Hammond would be dead [1,2].