McClean was lining up for the Baggies prior to their match against Charleston Battery when the national anthems started to be played.
During ‘God Save The Queen’, the Ireland international turned his back while his team-mates continued to observe the anthem prior to their fixture against the South Carolina side.
You can see the incident occur from 3:30 in the video below.
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He was labelled a “scumbag” amongst other insults on Twitter, as well as coming under fire from the press.
McClean is from Derry, the site of Bloody Sunday when, in 1972, British paratroopers killed 13 marchers after opening fire at a civil rights demonstration.
Prime minister David Cameron offered an official apology in 2010 when saying the killings were “unjustified and unjustifiable”.
The winger has been criticised on numerous occasions for deciding not to wear a poppy to mark Remembrance Day.

Ireland's James McClean (front) is challenged by Turkey's Ahmet Ilhan Ozek during their international friendly soccer match at the Aviva Stadium in Dublin May 25, 2014.

Image credit: Reuters

In November 2014, he explained his stance in a letter to Wigan chairman Dave Whelan, whom he played for at the time: “I have complete respect for those who fought and died in both World Wars - many I know were Irish-born. I have been told that your own grandfather Paddy Whelan, from Tipperary, was one of those.
“I mourn their deaths like every other decent person and if the poppy was a symbol only for the lost souls of World War One and Two I would wear one; I want to make that 100 per cent clear. You must understand this.
“But the poppy is used to remember victims of other conflicts since 1945 and this is where the problem starts for me. For people from the North of Ireland such as myself, and specifically those in Derry, scene of the 1972 Bloody Sunday massacre, the poppy has come to mean something very different.
“Please understand, Mr Whelan, that when you come from Creggan like myself or the Bogside, Brandywell or the majority of places in Derry, every person still lives in the shadow of one of the darkest days in Ireland's history - even if, like me, you were born nearly 20 years after the event. It is just a part of who we are, ingrained into us from birth.

James McClean

Image credit: Eurosport

“Mr Whelan, for me to wear a poppy would be as much a gesture of disrespect for the innocent people who lost their lives in the Troubles - and Bloody Sunday especially - as I have in the past been accused of disrespecting the victims of WWI and WWII. It would be seen as an act of disrespect to those people; to my people.
“I am not a war monger, or anti-British, or a terrorist or any of the accusations levelled at me in the past. I am a peaceful guy, I believe everyone should live side by side, whatever their religious or political beliefs which I respect and ask for people to respect mine in return. Since last year I am a father and I want my daughter to grow up in a peaceful world, like any parent.
“I am very proud of where I come from and I just cannot do something that I believe is wrong. In life, if you're a man you should stand up for what you believe in.”
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