On Thursday night, Durant seemed to add fuel to this fire.
While posing for a picture with San Francisco Giants mascot Lou Seal, No. 35 proudly held a plate of the small desserts, a reference that goes all the way back to the day he joined the Golden State Warriors.
Hours after Durant's announcement, Westbrook posted an Instagram picture of a Fourth of July-themed cupcake display.
Sports Illustrated's Lee Jenkins confirmed in October that it was Westbrook's way of calling Durant's decision "soft":
Then, when Durant returned to Chesapeake Energy Arena as a visitor in February, the OKC faithful showered him with "cupcake" chants and shirts:
Draymond Green and other Warriors players wore the shirts after demolishing the Thunder:
Keep tabs on Westbrook's Instagram in the coming days. Maybe he'll find another cupcake platter to post in response.
[h/t SB Nation, Twitter, Instagram]