I don't think there's anything to be proud about Jay Sean. His song was designed SPECIFICALLY for the US market, released by a US company, produced by US producers. It was a song MADE for American radio. There's nothing British in it besides the fact the singer was born in the UK (it's not like he even has an accent in the song).
When "You're Beautiful", "Rehab", "Viva la Vida", "Smile", etc. were hits in the US, it made sense to celebrate since they were British songs, by British producers which, even though were not originally for the US market, made it big there anyway. That's not the case with Down...