Jake Paul and Mike Tyson's bout was "embarrassing" for the former, believes KSI, who adds that the YouTuber-turned-boxer "has no shame" when it comes to his fighting career.
The Problem Child and The Baddest Man on the Planet faced off last Friday at AT&T Stadium in Dallas, Texas, with the former scoring a victory by unanimous decision.
With a three-decade-plus gap in age, and Iron Mike stepping into the ring for a professional bout for the first time since 2005, the clash always looked destined to be a mismatch.
Now, KSI - who has long been touted for a potential bout with Paul - has weighed in on the fight, feeling that it was a commercial success that misled fan expectations.
"The money was great for Jake and Mike," he told The Stomping Ground. "I guess we felt hard done by. A lot of people that watched the fight don't really watch boxing.
"They probably thought the 58-year-old Mike Tyson was going to be the teenage Mike Tyson they saw back in the day, and was going to absolutely destroy Jake Paul.
"He is an OAP. He is an old man, he had no right to be in the ring. Jake Paul is in his prime. I thought the whole thing was embarrassing,, but Jake doesn't give a s—t.
"He has no shame. He's had actual boxers calling him out to fight - [Artur] Beterbiev, [Daniel] Dubois. He's not going to fight any of those guys.
"He's going to fight the easiest people, and make himself look like he's the fucking best when he really is just a piece of s—t."
Undisputed light-heavyweight champion Beterbiev and IBF heavyweight title holder Dubois have both seemingly offered to fight Paul, though any fight appears unlikely at best.