Burt, the son of Bruce and his first wife Chrystie, says Foxx is just aping Kevin Hart to stay relevant because the latter is taking all his movie opportunities.
Ouch. Whether that's true or not, Burt isn't upset about Jamie, despite what some people felt were some insensitive, transphobic shots at Bruce.
As host of the iHeartRadio Music Awards, Foxx said Bruce was on hand to sing a male/female duet by himself, and that he was just busting Bruce's balls.
You know ... while he still has them. Oooh. Ba-dum-ching.
Neither Burt nor Bruce's younger sons Brody and Brandon Jenner (from his second marriage to Linda Thompson) have a beef with comedians, though.
It's just comedy, as far as they see it, and Bruce is an adult who can handle it. What Burt didn't appreciate was Kevin Hart at the Justin Bieber Roast.
Hart made a joke about Kendall Jenner and Justin Bieber hooking up as Kendall sat there uncomfortable, and Burt says he would've come at Kevin.
Seriously, we'd think long and hard before telling any future Kendall or Kylie Jenner zingers, particularly if they also involve that douche Justin Bieber.
See more notable burns from the Bieber Roast below:
You have to straighten up, son. Last year, you were ranked the fifth most-hated person of all time. Kim Jong-Un didn't rank that low. And he uses your music to torture people.
Let's get to the reason I’m here: to give Justin some tips for when he inevitably ends up in prison... The only place people will be following you in jail is into the shower.