Honestly there is always a lot of shit talk like this between elite wrestler teammates, especially jokers like Khabib and DC.
When I wrestled there were only 3 people on my team trying to make it to the state tournament. We talked more shit to each other than to the rest of the team combined. Lose twice and get eliminated right away in a tournament, you were gonna get shit talked. Someone loses to a doughy looking slob, they were gonna get shit talked. Pin someone in 30 seconds, well the guy who pinned someone in 10 seconds is gonna come talk about how that means he is better.
It's just the way banter works between two men who have only known combat and conflict their whole lives. It's almost like sparring, verbal sparring.
Its just fucking fun, a bunch of sensitive ass bitches who've never done sports or competed in anything are on Sherdog.