Yes, its a fun song and I'm sure Percy would be amazed that anyone could regard his type of 'oirish' humor as offensive. Yet its a menancholy fact that by gradually adopting the language of their conquerors the Irish eventually came to also adopt the English viewpoint as regards Ireland and the Irish with a view to giving the English-speaking world the images it could accept (and no doubt, pay well for). So today its mostly Irish writers perpetuating the 'stage Irish' stereotypes when most English writers would be too politically correct to do so. It all comes down to economics in the end it seems.