The man who Nate Diaz made flinch at the Jake Paul fight on Saturday is furious with the UFC star ... saying he now wants to KO the guy for embarrassing him.
If you missed it ... at some point during Paul's bout with Tyron Woodley, Diaz pretended to throw a huge haymaker at MMA fighter Carrese Archer in the stands.
The scene was captured on video ... and it showed Archer actually spilled his drink everywhere as he thought Diaz's punch was really coming in.
Security members broke everything up before it could escalate ... but now, Archer -- a bare-knuckle boxer -- says he's still so mad about it, he's gunning to knockout Diaz in a real fight.
"I've seen all the laughter -- everybody laugh, ha-ha," Archer said. "The same things that make you laugh make you cry. Nate Diaz is a bonafide female dog."
"He had the police with him, had the security protecting him and you gon' flinch at me and try to sucker punch me when I'm not paying attention?! And, y'all think this man's a gangster?!"
Archer continued, "I am a real street dog. I'm in the streets, believe that!"
Archer then called out Dana White -- who shared the video of the scene on his social media page on Sunday -- telling the UFC honcho to sign him for one fight so he can go after Diaz.
“I bet you won't think it's funny, you sign me for one fight and I knock Nate Diaz the f**k out in the first round," Archer said.
As for why the fake punch was thrown in the first place, it seems it's because Archer is pals with A.J. McKee, who also got in an altercation with Diaz over the weekend.