We love Billie Eilish and so do her fans, but they were NOT happy Thursday when she had to scoot on by them, denying them the opportunity to take selfies and get autographs from the emo-pop star at a Jimmy Kimmel Live taping.

Eilish was all smiles before fans turned on her! After refusing to sign autographs, a group of "fans" lost their cool and began booing and shouting expletives at the 17-year-old. One fan even shouted, "I hope you lose at the Grammys!" Ouch!

Billie recovered, though, and gave a great appearance on the show. She talked about being the youngest artist EVER (she's 17) nominated in all of the top four categories ... and two more. She also talked to Jimmy about dealing with fame, trying to be present, going on tour, her friendship with singer Jessie Reyez. Watch!