As a Kiwi who lost a couple of relatives in WWII, I would find it offensive also, one uncle died in Europe, another in Asia. BBMF remembers not just the Britons who died flying during the war as the Commonwealth had Kiwis and Aussies flying too.
One of my uncles considered himself unlucky, but the family thought otherwise. He was training on Hurricanes and had completed his training in New Zealand and was posted to England. His flight was actually on the runway when they were told to stand down as the war was over.
I know I would never have got to meet him if he had been in combat before that.
There is not a great number of these guys left and the countries they are from definitely need to remember the sacrifices made by them, but more so the ones that gave it all.