Seth Rogan is clearly not a Justin Bieber fan and has no problem saying how he feels. Following Biebers arrest in January, Rogan Tweeted 'All jokes aside, Justin Bieber is a piece of s**t." Well clearly Seth's feeling still haven't changed because in an interview at SXSW Seth reiterated. “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—.”