But, Selena Gomez doesn't think Justin Bieber should be so hard on his fans.
Justin's taken to Instagram to warn he'll switch his account to private if people don't stop criticising Sofia Richie, who's rumoured to be his new girlfriend.
Selena - who used to date Justin - has now replied to his post, saying: "If you can't handle the hate then stop posting pictures of your girlfriend lol - it should be special between you two only.
Don't be mad at your fans. They love and supported you before any one ever did".