Justin Bieber to Seth Rogen: Dude, Sorry I Didn't Treat You Like a King

Justin Bieber has had about enough of Seth Rogen's smack talking.

The "Neighbors" star, 32, has been a vocal opponent of the 20-year-old Canadian singer's shenanigans, openly criticizing his bad behavior on several occasions this year, beginning in January when Bieber was arrested up until earlier this week. Now, for the first time, the Biebs is having his say:

While Bieber may still love Rogen's movies, he didn't love him enough to spell his name correctly — or maybe he misspelled it on purpose. Either way, he was referring to Rogen telling Howard Stern earlier this week that the "Boyfriend" singer wasn't nice when they've met.

"I met him a few times," Rogen said Monday. "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."

During their first interaction, backstage at a German talk show, Rogen was told Bieber wanted to meet him, but the drama-plagued singer acted like Rogen was the one who requested the introduction.

"'What the f--k, I don't give a f--k about, I don't want to meet you!" Rogen recalled to Stern. "Don't act all nonplussed to meet me. I didn't want to meet you. I was totally cool not meeting you."

He went on to say that Bieber possessed "no humility, no awareness, no sense that 'I appeal to young, young people, maybe a grown man who works in comedy doesn't f--king give a s--t about me.'" The first time Rogen ripped Bieber was in January when he called him a "piece of s--t" on Twitter after his DUI arrest.

In March, he maintained that stance while talking with Andy Cohen on "Watch What Happens: Live."

"Oh, it's because, in my opinion, Justin Bieber is a piece of s--t," Rogen said with a laugh. "He seems like he is obnoxious and ungrateful and insincere. He puts people's lives in danger with his horrible, horrible behavior. And overall he acts like a piece of s--t."

Don't expect the fellas to smoke a peace pipe anytime soon. Well, at least not together.