Actually It Was Back In March.

https://www.bbc.co.uk/news/uk-england-59317136

When the US had its options explained to them;

A. Get Britain to reverse it's decision to self-exclude.

B. Respect Britain's decision to self-exclude.

C. Fail.

https://www.bbc.co.uk/news/world-us-canada-56452471

So Britain should certainly be demanding an apology.

As A was the only option that would ever going to be in its best interest.