Lox, that is nonsense.

A plastic Paddy is someone who is not Irish whose pretence is the adoption of the caricature extreme stereotypes of Irish behaviour - the English Etonian who insists on starting sentences with "Top of the morning to you, begorrah!" It speaks of the non-Irish.

A coconut is a person whose skin is black but who has adopted the treachery of Babylon. It speaks of the black. NB "Black" used in the English sense.