"He seems like he's obnoxious and ungrateful," the actor tells Andy Cohen.

Mar 13 - The Dish

It's no secret that Seth Rogen has disdain for troubled pop-star Justin Bieber. Back in January, the actor made waves on Twitter when he called Justin a "piece of s--t."

He continues to have no apologies about his hatred for the Biebs, who is embroiled in a series of legal issues (and battling an embarrassing leak of a recent deposition).

On last night's WWHL, Andy Cohen got Rogen to open up.

"In my opinion, Justin Bieber is a piece of s--t," Rogen said. "He seems like he's obnoxious and ungrateful, insincere, and he puts people's lives at danger and overall he acts like a piece of s--t."

Bieber is currently battling a series of legal issues on both coasts. Last month, the singer was arrested for a DUI and drag racing in Miami. And he's also being sued for allegedly throwing eggs at a neighbor's home in Los Angeles. (Thankfully, he's got Lea Black's husband representing him in court for some of his troubles!)

Rogen, who was visiting the Clubhouse while in Austin for SXSW, also "spilled the herbal tea" on which Hollywood stars are stoners. You may be surprised to see what he had to say about Barbra Streisand. Watch below: