Grew up in the Creggan, so he knows all about suffering does he?
Well it's not too far from West Bromwich to Birmingham, where a few of the locals could tell him a bit about suffering:
https://en.wikipedia.org/wiki/Birmingham_pub_bombings
It is the norm to play the National Anthem before all sports events in the USA, with the players and officials turning to face the flag. (Which we may find strange, but that's just the way it is).
So that when they were playing an overseas team, they also played their anthem, as a simple courtesy. (Not to play it might have been seen as disrespectful).
All the WBA players respected the US anthem, just as all the Charleston players respected the English Anthem.
But not McClean.
Even though it was in honour of the team which pays his wages.
And in a "neutral" country.
And wasn't singling him out any more than any of the other Nationalities who were on duty on the day.