Heading into the main event of UFC 199 on Saturday night, it was clear for all to see that there was no love lost between Michael Bisping and Luke Rockhold.
The British fighter's first-round KO win over his American opponent in Inglewood, California didn't exactly do much to ease the tension. In fact, the pair continued their war of words in the post-fight press conference.
It was there, though, where Bisping could have landed himself in trouble after cameras caught him using an anti-gay slur towards Rockhold as the latter fighter made for the exit. You can see the footage for yourself further down this article.
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After exchanging barbs which included Rockhold refusing to shake the Brit's hand and Bisping responding with reminders about a previous sparring session KO, the new UFC Middleweight champion overstepped the mark:
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As you can see in the footage, Bisping can be seen almost immediately realising the inappropriateness of his comment as, almost without a breath, he says "S***, I shouldn't have said that."
Even at the start of the video clip, the 37-year-old can be heard calling Rockhold a "p***y" - a comment that could very well lead to criticism in its own right.
It is his use of the term "f****t", though, which could potentially land him in trouble with the UFC and see the organisation hand down some form of punishment.
Considering, too, that Bisping has a history of using anti-gay terminology during his career - most notably in a promo for UFC 127 and a couple of inappropriate tweets - it does not paint the veteran fighter in a good light.
The incident puts something of a dampener on what was a momentous night for Bisping. His first-round upset win over the now former Middleweight champion marks the culmination of an impressive return to the higher echelons of the UFC.
Having defeated Anderson Silva earlier this year, his win over Rockhold has seen Bisping rebuild a reputation that had been dented with two defeats in his previous five bouts prior to 2016.
Often seen as a bad boy of UFC, his impressive form had also seen him improve his reputation outside of the octagon, somewhat.
Despite his offensive remarks on Saturday night, it doesn't look like Bisping is ready to give up mocking Rockhold in general, however.
Indeed, early on Monday morning he took to social media to continue his gloating. Fortunately, this time, his message was more innocent in its tone: