Agreed Euros have more exposure to Euros. General Patton once said something like "English and Americans are a common people divided by a common language".
Brits has a variety of different words for different things, off the top of my head: flat, fag, lorry, bonnet and, my favorite, fanny. An American "Fanny Pack" often results in a lot of laughs from Brits.
FWIW, I've worked with a lot of flight attendants, most American and of all skin tones. One memorable FA was a Brit of African descent. People noticeably treated her differently than similarly looking FAs who had a NY or Mississippi accent. They were always nicer to her than others. I could see this a they left out the main cabin door saying good bye and I was watching from behind her.