Probably their approximation of received pronunciation.

Americans have really shitty ears. Any white person who sounds anywhere between "Chimney Sweep in Mary Poppins" and "King George in Hamilton" is automatically classified as British.

And yes, I know both of those characters are originally portrayed by American performers.

Black, Indian, and Asian people with a British accent make our brains explode.

Well we can probably deduce that it wasn't welsh due to the lack of consonants.

Edit: realised seconds after posting that welsh is probably considered a language.

I have an amalgamated accent, like most terminally online people do.

It's clearly Germanic based, but it's neither a Danish, German, Dutch or Swedish accent. It's just international with Germanic roots.

People are weird about accents. I only wish there was more variety in American accents, if anything. Some of them are charming.

English, simplified

Or, and hear me out, it's fake. Have you ever met one parent of a kindergartener, let alone a whole class of kindergarteners walking to school without their parents? Yeah me neither.

There's a crossing guard with an accent.