(CNN) – Some viewers of the iHeartRadio Music Awards on Sunday night took to social media to vent about the opening monologue, saying one controversial joke crossed the line.

Musician and actor Jamie Foxx hosted the second annual awards show in Los Angeles.

“We got some ground-breaking performances, here too, tonight,” Foxx said. “We got Bruce Jenner, who will be doing some musical performances. He’s doing a his-and-her duet all by himself.”

There have been reports that Jenner, an Olympic gold medalist, plans to transition from male to female. However, Jenner has not spoken publicly about any such possibility.

Many television viewers took to social media to voice outrage. The hashtag #iHeartRadioMusicAwards rocketed to become a top trend.

“Jamie Foxx just made a terrible, disgusting joke about Bruce Jenner’s rumored transition on this trash awards show,” tweeted @laurennostro.

“Seriously #JamieFoxx? #BruceJenner jokes?” wrote @AngelaPquigley. “You’re disgusting, that’s not ok. It wasn’t funny, just mean spirited and lazy.”