Children would not have heard the Grand Old Duke of York Nursery Rhyme.
The words of the nursery rhyme are believed to refer to Richard, Duke of York, claimant to the English throne and Protector of England and the Battle of Wakefield on December 30, 1460.
Given they exist in basically every single cultures across history I'd say that would need more than ASB, more like multigenerational brainwashing by evil fungus bent on enslaving humanity in their evil fungal ways.