on name calling

From this point forward the march of events were rapid
Mr. Coston, rising, asked Mr. Dawson who he thought, Mr. Dawson, was.
Mr. Dawson, extinguishing his cigarette and placing it behind his ear, replied that he was the fellow who could bite his, Mr. Coston, head off.
Mr. Coston said: 'Huh?'
Mr. Dawson said: 'Sure.'
Mr. Coston called Mr. Dawson a pie-faced rubber-necked four-flusher.
Mr. Dawson called Mr. Coston a coon.
And that was where the trouble really started.
[psmith journalist]