Stipe Miocic says the guy Conor McGregor attacked at a pub back in April is one badass dude ... telling TMZ Sports he's got a CHIN OF STEEL!!!
The UFC superstar says he's seen our vid of Conor clocking the bar patron for rejecting his whiskey ... and Miocic has gotta give props where it's due -- saying the guy soaked in that hit like a pro!!!
"I give that guy a lot of credit, he ate that [punch], too," Stipe says .