Seth Rogen's hatred for Justin Bieber has been called hilarious, shocking and offensive. But we're starting to wonder if the Neighbors actor has gone too far.

Recently, Rogen shocked fans when he called the "Baby" singer a "piece of sh*t." On Monday, Howard Stern asked the comedian about his original comment and Rogen didn't mince words.

UPDATE: Justin Bieber Responds To Seth Rogen's Insults

"I met him a few times," Rogen told Howard Stern. "He's a good example of someone, who you meet, who you think you are going to hate and then you get to hate him ... you meet him and he lives up to every one of your expectations."

Rogen was furious after his first meeting with Bieber. Rogen recalled how Bieber asked reps if the comedian would meet him. But when Rogen was introduced to Bieber he reportedly changed the story, saying Rogen asked to meet him.

Justin Bieber and Seth Rogen Justin Bieber and Seth Rogen haven't spent much time together, but they did have an encounter at the MTV Movie Awards in 2011.

"What the f***, I don't want to meet you!" Rogen said of the first encounter. "Don't act all nonplussed to meet me. I didn't want to meet you."

Then Rogen saw him again at the MTV Movie Awards in 2011. But he was no more impressed the second time.

"I saw him again at like an MTV awards show, he literally had a snake wrapped around his f**king wrist that he was wearing," Rogen said. "I talked to him for like five minutes. ... No humility, no awareness."

RELATED: Is Justin Bieber Dating A Fitness Model?

Rogen is far from the only actor who's criticized Bieber. These five stars have had it with the singer's bad behavior:

1. Jon Hamm

Jon Hamm Jon Hamm thinks Justin Bieber’s need parents need to take more control of the singer’s life.

Jon Hamm grabbed headlines recently after he slammed Justin Bieber in Men's Fitness magazine.

“Look at Bieber or whoever,” Jon Hamm told the magazine. “You’re like, ‘What the f**k, man? What are you doing? Why?’ There's no one telling those people no, and it’s a shame.”

“[He should have] a mom or a dad or a really good friend who can say, ‘Hey, s**thead!’” Jon Hamm continued about Justin Bieber. “You see people in the world and you're like, 'Do you know how a washing machine works? Do you know how to wash a dish?’ Life skills are something we're missing … just s**t you needed to learn in life."

2. Jon Bon Jovi

Jon Bon Jovi Jon Bon Jovi slammed Justin Bieber after he was late for a number of his concerts.

Jon Bon Jovi was disgusted when Bieber was late for a number of concerts. "Every generation has guys that do that, none of that is new. They run the risk of disrespecting their audience members who have worked hard to pay for their ticket, to give you the permission to take two or three hours of their lives -- or in that kid's case, 80 minutes of their lives," he told the London Evening Standard.

"Do it once, you can be forgiven," Bon Jovi continued. "Do it enough times and shame on you. They won't have you back. Then it just becomes a cliche. It's really not cool - you're an a**hole. Go to f**kin' work!"

3. Olivia Wilde

Jason Sudeikis and Olivia Wilde Olivia Wilde took to Twitter to criticize Justin Bieber for the shirtless pics on his birthday.

Olivia Wilde stepped into the fray last May when she saw that Bieber was running around shirtless on his birthday.

In May 2013, Bieber said his birthday was the worst he'd ever had, but that didn't stop Wilde from bashing the singer for flaunting his bare chest in London.

"Bieber, put your f**king shirt on [unless you lost all your shirts in a fire in which case my condolences and please purchase a new shirt." she wrote on Twitter at the time. We have to be honest. We had a good laugh at that one.

4. Drake Bell

Drake Bell Drake Bell called out pop stars like Ariana Grande, Lady Gaga and Justin Bieber for doing nothing to stop negative behavior from their fans.

Drake Bell and Justin Bieber's feud reached epic proportions recently when Bieber tried to crash Bell's launch party. But we can kind of understand why Bieber is getting sick of Bell. He won't stop talking about the "Baby" singer.

“I can’t stand that, with a lot of the pop stars, there’s this idea of ‘Are you in our clique? Are you a Direction-er or are you a Belieber? Oh, you’re not in our gang? Then you’re not cool and you need to go in a hole and die,’” Bell famously said.

“I don’t understand it. And what’s worse is artists like Lady Gaga and Justin Bieber don’t come out and say, ‘I love having you as my fans, but you shouldn’t be acting this way.’ They just eat it all up, and I think it’s repulsive.”

5. Taylor Swift

Taylor Swift Taylor Swift is being sued for trademark infringement by Lucky 13. Lindsay Lohan just won a lawsuit against another clothing company. And countless other celebs are facing fines. Do people love to sue celebrities?

Taylor Swift has long been one of Justin Bieber's fiercest critics. So much so that she has reportedly ended her friendship with Selena Gomez when Gomez started dating Bieber again.

“Taylor hates him,” a source told Us Weekly in August 2013. “She thinks Selena makes a mistake every time she reconciles with him. Bieber has really come between the girls."

And it's only gotten worse. “She is already aware of them getting together and hates the latest developments with Selena and Justin,” a source told Hollywood Life. “She finds Justin to be one of the worst people she has ever met. She hates him and hates that he has this control over Selena.”

Check out Justin Bieber's controversial deposition video below and tell us: Do you think these stars are judging him unfairly?