I think you got to draw a line somewhere for this sort of stuff, theres a certain age and below where it seems unfair to anyone to be held to what was said or posted at that age. Thats not to say they cant/shouldnt be corrected at the time about it, that its wrong to say it. Many a daft thing said by kids without realising the impact though or understanding fully.
Once someone is an adult though then fine ofcourse they should be held responsible for what they say.
Its England at the moment the focus is on but this will be happening at every team in every sport its just if and when someone starts looking.