Seth Rogen
Actor Seth Rogen arrives at the 2014 Vanity Fair Oscars Party in West Hollywood, California in this file photo taken March 2, 2014. As a married former party guy transitioning into suburban parenthood, Rogen wages war with the frat house next door in the raucous new Nicholas Stoller movie, "Neighbors," that screened this weekend as a work in progress at the SXSW Film Festival. REUTERS/Danny Moloshok/Files Reuters

Seth Rogen still isn’t a fan of Justin Bieber. The “Neighbours” star is once again firing shots at his fellow Canadian, just a few weeks after calling the young singer “obnoxious.”

In January, Rogen made himself an enemy of the Beliebers after tweeting:

All jokes aside, Justin Bieber is a piece of shit.

— Seth Rogen (@Sethrogen) January 23, 2014

That tweet, which was retweeted over 200,000 times since, was in response to Bieber’s DUI arrest.

When he was asked to clarify what he meant with the rude tweet in March, Rogen told “Watch What Happens Live” host Andy Cohen a more detailed explanation.

“In my opinion, Justin Bieber is a piece of s***,” he said. “He seems like he’s obnoxious and ungrateful and insincere and he puts people’s lives in danger with his horrible, horrible behaviour.”

He’s not finished with his anti-Justin Bieber tirades, though.

In a new interview with shock jock Howard Stern on Monday, the comedian recalled the time he met the pop singer for the first time, saying Bieber didn’t fail to meet all his expectations, the bad ones, that is.

“He’s a good example of someone you meet, who you think you’re going to hate him, and then you get to hate him as much as you thought,” he said. “You meet him, and he meets up to every one of your [bad] expectations of how you hope he will be.”

Rogen and Bieber were guest appearing on a German talk show at the same time when Bieber’s people asked him to step outside of his dressing room to meet the tween heartthrob.

“And it was weird, I was like, ‘Sure, I’ll meet him.’ So I went outside to meet him and he was acting like I asked to meet him! It was very nonchalant, ‘You man. Sup,’ and I’m like, ‘What the f***, I don’t want to meet you. Don’t act all nonplussed to meet me I didn’t want to meet you! I was totally cool with not meeting you!’

“But I was like, fine, I wouldn’t have said anything. I was like, ‘Hey, he’s a bit of a mother*****. He’s young, the kid’s a d***.”

Rogen met the “Baby” singer for a second time when they were at an MTV Awards show two years later. As the “Paul” star recalled, it was still an unpleasant reunion.

“He literally had a snake wrapped around his f****** wrist that he was wearing. It was a live snake,” Rogen laughed. “I was like, what the f***?’ And I talked to him for like five minutes and I just remember thinking, ‘F*** this kid.’”