I've lived in France for 15 years, and I'm still flummoxed by the widespread use of 'Anglo-Saxon' to describe what - as far as I can tell - are English-speaking British (or maybe just English) people.
I have colleagues from the US who find the term offensive, due to the connection with WASP / white supremacy / racism. I myself am Scottish, and don't feel any connection with the term whatsoever - it makes me think of horned helmets and the pillaging of villages. it's not a term I ever heard used in the UK
Yet when I try to explain this to my French colleagues they are genuinely unconvinced that either irrelevant or inappropriate. Unfortunately my boss (very English, expat, married into a French family and lived here for a long time) and the British Ambassador to France both use it 🙄.