The singer/actor is convinced high-profile artists have a responsibility to set a good example to their loyal devotees, and put them straight if they step out of line.
However, Bell fears many big stars are guilty of failing to discourage bullying among their fans.
He tells Buzzfeed.com, "With a lot of the pop stars, there's this idea of 'Are you in our clique?Are you a Direction-er (One Direction fan) 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'. 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..."
Bell reserves particular criticism for Gaga, insisting the Poker Face star, who runs an anti-bullying charity, should do more to help.
He adds, "Lady Gaga, who says she's so anti-bullying, was on (Howard Stern's radio show) and Howard read all of these awful, awful tweets her fans had been sending him, (and he) asked how she responded to her fans doing the exact antithesis of what she stands for. She said, 'You have to understand, Howard, it comes from a place of love. They don't want to see me get hurt.'
"I couldn't believe she didn't take a second to address her fans and say how disgusted she was they'd do something like that. But none of them do that. Justin Bieber just tweets, 'Yeah, Beliebers, go hard' when they're attacking somebody. Ariana Grande's fans told (blogger) Perez Hilton that he and his son needed to die and get cancer, and she just fed it. It's disgusting."
Bell is adamant that other stars should follow his lead as he has found a simple way to keep his fans in line, explaining, "If I catch one of my fans saying something improper, a gay slur or any derogatory term, I instantly tweet directly at them and say, 'This isn't how we do it.'"