It all started when DeLaet went to Twitter to say he'd "puke" if top NHL draft ConnorMcDavid ended up being drafted with the Leafs, who have struggling through an extended losing streak.
As might be predicted, Leafs fans went berserk.
"If it makes you feel any better, I've never heard of you," was one of the kinder comments.
"Shut up and concentrate on golf," was more typical.
Rather than shut up, however, DeLaet kept the flame-war going. For hours.
Here's the blow-by-blow...
On mobile? Check out our gallery of tweets featuring Graham DeLaet versus Leafs fans.