Robert Downey Jr. won big at the Critics Choice Awards this weekend — and to pay back the favor … he rattled off some of the worst reviews he’s received throughout his career.

The superstar went onstage Sunday to receive his statuette for Best Supporting Actor — honoring his work in “Oppenheimer” — and while he was going through his thank-you’s … he ended up acknowledging the group that was voting on that night’s winners … critics!

RDJ said he had a soft spot for this noble profession — while also pointing out he’d received not-so-nice reviews from said critics over the years … some of which he wanted to read.

It was hilarious … Rob pulled out a list from his coat and started going through what he considers the nastiest and/or most humorous feedback he’s gotten for his on-camera work since he’s been in the biz. He didn’t name any names, but the words spoke for themselves.

Just a few of the reviews that left a mark … including a haiku of sorts that read “Sloppy, messy and lazy.” The next one was more metaphoric, as he puts it … “Like Pee-wee Herman emerging from a coma.” Finally, one that stayed with him … “Amusing as a bed-locked fart.”

Again, Downey Jr. didn’t elaborate on when these reviews were dished or for what movies/performances of his — but we’re sure a simple Google search can track ’em down.

Rob’s had a long career of highs and lows … now, he’s an awards darling. Take that, haters!