[jaimebuelta]

There's also the fact that, due AE being all the time in the TV, the average Brit can understand it much better than the other way around. A lot of americanisms are favoured by not-so-young people.

They were complains of American fans not understanding Peter Capaldi as the new Doctor, as he has a (VERY understandable) Scottish accent.

[duncanawoods]

I wonder to what extent American dialects are objectively easier to understand because they are the younger result of synthesising existing languages\accents rather than a UK dialect that has diverged due to isolation.

[iopq]

They're easier to understand because of Hollywood. If the United Kingdom made all the movies, everyone would think American dialects are really hard to understand.

Besides, nobody understands Southerners anyway.