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don't see Basil mentioning "the war" in every sentence as a joke at the expense of Basil, they see it at the expense of the Germans.
They really don't. The joke is that bringing up the war would be insensitive to Germans (and a really stupid thing to say to German guests if they're in your hotel). The line is "don't mention the war", which he repeatedly says to his staff while inadvertently referring to it himself (because he's concussed having been hit on the head by a moose). Of course it's a dig at him, the Germans are just guests who he's managing to offend, just like he offends so many other guests. It's a joke entirely at his expense.
Yes that's the premise, but my argument is that the people defending the show as if ice cream has just been outlawed don't see Basil mentioning "the war" in every sentence as a joke at the expense of Basil, they see it at the expense of the Germans.