"Happy place," Richie wrote, hovering over her pie.
After spotting the pic in his feed, Bieber immediately jumped into Richie's comments to pay her a compliment.
"You are gorgeous," Bieber wrote, later adding two exclamation points for emphasis.
But Bieber's kind words oddly enraged his fans.
Trolls attacked Richie, blatantly slut-shaming her and calling her a snake.
They began pitting Richie against Bieber's other ex-girlfriends, Selena Gomez and Hailey Baldwin.
Several fans were appalled by the awful comments and quickly told the haters to get lost.
But the harassment continued.
All Richie did was literally post a picture of her pizza, yet one simple comment from Bieber opened the floodgates to an intense round of slut-shaming.
Fans need to realize that the sexist comments toward Richie (and Bieber's other ex-girlfriends) are not OK.
Richie nor Gomez nor Baldwin are defined by their current or previous relationships to him.
But sadly, this isn't the first time Bieber's fans have put Richie in this situation.
In August, Bieber had to actually delete his Instagram after his followers wouldn't stop harassing Richie.
Clearly, they didn't learn their lesson.
Word to Bieber's "fans" — the slut-shaming needs to stop.