Your understanding seems to be very shallow. For Irish people, particularly those nationalists who grew up in the midst of the troubles, God Save The Queen is symbolic with the British Imperialism that forced the nationalist community to forcefully live as second class citizens in their own country for years on years. If you can't empathise how any Irish person might have the same stance as McClean then I feel you have a very shallow understanding of matters. McClean came from an area which was probably one of the most impacted by the British Armed Forces during the troubles, I doubt you'd find many people from the Creggan who would disagree with what he did.
Clearly more so than a small minded bigot like you.
And still you avoid the point regarding him being a thick as pig-shit hypocrite. He clearly thinks more the English pound than he does of his countries 'proud' history (including colluding with Nazi Germany).