But they didn't call themselves 'Turkish-Ferman', or 'Pakistani-British', because those constructions don't exist here. I'm am immigrant to the UK myself and I call myself British, an immigrant, or [birth country anonymised] depending on the context. But there is no such thing as the hybrid diaspora identity here, by that type of name, and we lack the analogy to 'African-Brits'.
What your husband has is a failure of imagination to see how things are different in this new country. It's a culture shock thing. He needs to understand that even if it's foreign to him or even bordering on offensive, it's still a phenomenon which exists in this country, which is meaningful to people, and which he needs to get used to and get to know not shout at.