Jon Stewart is not opposed to telling those he dislikes the facts to their face, and such was the case with shock jock Anthony Cumia, who he saw at New York’s famed Comedy Cellar.

Anthony was fired from SiriusXM in 2014 after his racist tirade. And as he recounted on his Compound Media show: “We look at each other, so I put my hand out and go, ‘Hey, Jon,’ and he goes, ‘I’m not shaking your hand, you f - - king piece of s - - t.’ Whoa, well, my reputation precedes me.”

After he asked Jon what the problem was, Jon allegedly responded, “You talk a lot of s - - t about me.”

Cumia then said, “How long have you been in this business? . . . You don’t know how this works?”

Apparently things got really bad that the owner had to calm things down between the two. “So there were a lot of ‘f - - k yous’ and s - - t going back and forth at this point and Noam . . . is very nervous because Jon Stewart is one of the big stars who come in . . . and I’m like, ‘I’m not gonna hit him,’” Anthony said.

He added: . “I don’t fight . . . I was laughing about it, because it was so dopey. Whatever. Jon Stewart is a f - - king a - - hole. I don’t think he’s ever been a good stand-up.”