Like another poster said, those of us who weren't at the game didn't hear the birthday singing. Also, it's only been posted on here the last day or 2 that this was the case.
So for us we saw a UK player laughing on the bench while we were losing by 20 to an opponent we should be beating by 20. Given that context the outrage was well founded. If the birthday singing was known, the outrage would have been much less substantial.
This is a classic case of using hindsight to come back and ridicule people. Honestly, what true fan of which team would be ok with a player laughing while their team was being demolished by a team they should be demolishing? Get off your high horse.
I'll make it clear: given the now well-known circumstances that he was smiling at the crowd's singing of happy birthday, him smiling is a non-issue.
I think the word outrage shows how some of UK fans take a basketball game too serious.