Bleacher Report found itself in hot water with Dallas Mavericks owner and Shark Tank personality Mark Cuban over a tweet they sent out this past Saturday.

The infamous tweet read DIRK FOREVER and featured a gif of Mavs player Dirk Nowitzki throwing up an air ball. This prompted Cuban to send a profanity-laced email straight to the President of Bleacher Report’s parent company Turner, David Levy.

“Who the [expletive] thinks this is remotely acceptable and why are they working for you David?” wrote an irate Cuban. Levy responded, saying that it was just a joke aimed at “millennials”, prompting Cuban to threaten to “communicate with the millennials in the way i know how”.

Cuban then tweeted out the email conversation to his followers, deleting it when BR finally deleted their Dirk tweet. They have since tweeted an apology.