What's wrong with saying "no" when someone asks where you are from?

I am British, living in France. When people at work/social event etc find out I am British, they inevitably ask "where are you from?". I find it weird because they don't ask the French people this, just the British. They just seem happy knowing the French people are from France and don't need to know the town. I often respond with "the UK" and they just look at me weird.<br><br>I am not a morning person, so my brain struggles in the morning, so it takes me a few seconds to compute it and respond. "I am from a town called Reading". Why can't they be happy with me just saying "the UK"? I don't care where in France the French people are from, why do they need to know exactly where in the UK I am from? Am I just being overly sensitive about it? It just gets annoying having to play this game every time I meet a new person.<br><br>Edit: Thanks for the responses so far, it's been very interesting. I think some people in this thread have the same issue that the people asking me the question have. I am from the UK, but I am not from the whole of the UK. Therefore, I am happy to give a location by just saying UK. If someone from the US said "I am from the US", I would be happy with that and wouldn't push for more.