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Liam Payne, one-fifth of One Direction, wants fans to know he doesn't appreciate when they badmouth his girlfriend on social media. 

He took to Twitter following the London premiere for their upcoming movie "One Direction: This Is Us."  Liam wrote that while he is grateful for the support of the tens of thousand of fans who showed up on Tuesday, it's "always sad" to get on Twitter and "read horrible stuff about someone you care about."  

Earlier this week, Liam confirmed a new romance in his life, with a childhood friend named Sophia Smith. 

It appears fans didn't react well to the news, as the 19-year-old even dropped an f-bomb in his message to fans, while reminding them of the Golden Rule.  

He said, "...There is that old saying tho if you ain't got s*** nice to say then f*** you."

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