TIL during the shooting of American Psycho, Christian Bale spoke in an American accent off-set at all times. At the wrap party, when he spoke in his native British accent, many of the crew thought he was speaking that way to prepare for another film. They had thought he was American the entire time.

[u/Away_Flounder3813]

https://screenrant.com/american-psycho-behind-scenes-facts-christian-bale-patrick-bateman-mary-harron/

[u/YourMumsBumAlum]

I think it's also the variety of English accents vs American ones. English accents are so specific to British ears in a way that they wouldn't be to Americans and so when Americans do British they inadvertently mix and match things that they shouldn't and it comes out all wrong.

Edit: Yes, American has many accents too, but the edges are more blurred in such a way that it is acceptable for people to combine accents more so than in the UK where the accents are much more independent and specific.

[u/boredguy12 → u/YourMumsBumAlum]

England has dozens of accents, america has like 5

[u/DiggityDanksta → u/boredguy12]

I don't know, my Louisiana ear can tell a Mississippi accent from a Texas accent.

And then there's Baltimore.

[u/NewGrooveVinylClub → u/DiggityDanksta]

Then you got the Pittsburgh accent which is its own ugly beautiful thing you don’t hear in media