Paul, 26, suffered his first professional boxing loss at the hands of Love Island star Fury, 23, as he was beaten by split decision in Saudi Arabia.
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The result damages a potential fight between YouTube sensations Paul and KSI.
And the Brit – who also goes by JJ – revelled in his American counterpart’s defeat by mocking his performance.
In his first video posted to social media, KSI said: “Yo! Ahhhh don’t mind me, just smoking on that Jake Paul pack!
“Honestly, Jake Paul – trash! Tommy Fury – trash!”
Later, he took to Twitter once more to jokingly claim Paul lost because he was not drinking his Prime energy drink.
He added: “Jake. You see the problem with you man, the reason why you lost, is because you weren’t drinking Prime baby!
“I stay winning, I stay winning b****.”
KSI called out Paul last month following his stoppage win over YouTuber Temperrr.
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He said: “I need to be tested. I need more tests until I reach the final hurdle, Jake motherf****** Paul.
“That’s the end-game ladies and gentlemen, I said I wanted him at the end of the year and I will get him, trust.”
Meanwhile, Paul has already claimed he will trigger his rematch clause against Fury.
He said: “I felt flat, I got sick really bad twice in this camp. It wasn’t my best performance.
“But I lost, I’m not making any excuses, I’ll just say it wasn’t my best performance tonight.
“Like I said, we’re going to come back and get that W. Don’t judge me by my wins, judge me by my losses. We’re going to come back stronger.”