The problem here is bigger than one pub...
72 years after the war's end we in Britain (and particularly England) bang on about it as if it was last week. We still stereotype the Germans as Nazis even though there are probably more people in Britain with Nazi sympathies than there are in Germany. The rest of Europe (you know, the bits that actually had to live under Nazi rule for four years) have long since let bygones be bygones and have moved onto a greater European co-operation, looking to the future and how to avoid the mistakes of the past.
This (frankly, stupid) obsession with "How little Britain defeated the Nazi hordes" (even if it were true, which it isn't) paves the way for xenophobia, racism, religious intolerance and Brexit.
As for someone who trivialises domestic violence by using it as a promotion, words are not enough to express my disgust.