I am not sure whether this is considered as a community standard violation but it is surely problematic. This is not the first time I have encountered a player who leaves the game at the very beginning only because s/he does not want to play with the British. People are leaving the game for absolutely no valid reason is especially frustrating when you wait a long time for matchmaking + loading and someone quits at the very start and they get no penalty as leavers. I hope Relic takes some substantial action to prevent these.
Just check this one example!