Of more interest, to me at least, is why the use of argle-bargle when the more popular spelling is argy-bargy. I can’t actually remember seeing argle-bargle in any UK newspaper.
I think the earlier discussion made it pretty clear that (a) argle-bargle, while originally Scottish, is more common, though still rare, in North America than in Britain, and (b) argle-bargle and argy-bargy have different senses. Argle-bargle refers to verbal argument. Argy-bargy has a physical component, pushing, shoving etc., up to but not including actual fisticuffs.
notoneoffbritishisms.com 
Of more interest, to me at least, is why the use of argle-bargle when the more popular spelling is argy-bargy. I can’t actually remember seeing argle-bargle in any UK newspaper.
Which was commented upon in the linked item.
I think the earlier discussion made it pretty clear that (a) argle-bargle, while originally Scottish, is more common, though still rare, in North America than in Britain, and (b) argle-bargle and argy-bargy have different senses. Argle-bargle refers to verbal argument. Argy-bargy has a physical component, pushing, shoving etc., up to but not including actual fisticuffs.