Kos was a cool dude- damn good wrestler, strong fighter in his heyday, but he wasn't exactly known as the most articulate guy out there.
That TUF was notable for his getting murked by Brad Tate, the medic, in a war of words.
Whenever someone gets caught up in one particular talking point in a diss battle, you know it's not going so well. Just like where all Rampage could say about Schoonover was, "He's got titties!" over and over again, Kos just kept maintaining that Tate was a male nurse, while Tate basically effectively mocked him and his team.