So, I'm English so we don't have any clear culture as we are mainly made from other cultures.
First it was the Romans. Then the Germans, then the Vikings, the the Scandinavians.
It's pretty much an amalgamation of other cultures, it's pretty overlooked if this would be in regards to a game as not many in game worlds have that varied pasts. Most games keep it simple really, I suppose it would be hard to infer bias towards certain people in just text though.
For example as an English person, we dislike Wales as sheep shaggers , the French are frogs or wusses, Americans are yanks and speak English wrong. I could go on but it'd be interesting to see inferred culture in a game, I reckon it would help with immersion a lot.