BOSTON – JUNE 10: Glen Davis #11 of the Boston Celtics speaks to the media after the Celtics defeated the Los Angeles Lakers during Game Four of the 2010 NBA Finals on June 10, 2010 at TD Garden in Boston, Massachusetts. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this Photograph, user is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Jim Rogash/Getty Images)

Ah, nothing like a public feud between two totally irrelevant people. During a Wednesday appearance on FS1’s Undisputed, LA Clippers guard Austin Rivers took some shots at former teammate Glen Davis, saying the forward was out of shape and did not know the playbook.

Now Big Baby has responded by getting personal. In an Instagram video, Davis interrupted his Hawaii vacation to call Rivers a “bum who’s been given the world.” He finished his rant by telling Rivers to “shut up and stay under your father.”

Rivers’ dad is Doc Rivers, who coaches the Clippers. Doc coached Austin and Davis together during the 2014-15 season in Los Angeles, and he also had Big Baby for four seasons in Boston.

Davis started this whole back-and-forth a few months ago when he criticized Doc Rivers’ ability to adjust and said the coach was “lucky as hell” to win the 2008 title with a Celtics team that featured Paul Pierce, Kevin Garnett and Ray Allen.

[Fox Sports 1]

About Jesse Kramer

Jesse is a writer and editor for The Comeback. He has also worked for and runs The Catch and Shoot, a college basketball website based in Chicago. He is a graduate of the Medill School of Journalism at Northwestern University. Follow Jesse on Twitter @Jesse_Kramer.