Why Was Justin Bieber Cursing Fans At Disneyland?

Justin Bieber tends to show his fans nothing but his infinite love and has no problem doing random acts of kindness for them. From visiting less-fortunate schools to surprising a cancer-stricken fan and her family for Valentine's Day, the 17-year-old pop sensation is known to go out of his way to show love to his fans. So why did the Biebs flip off and curse at a fan at Disneyland? 

Justin along with girlfriend Selena Gomez and his family were at the Happiest Place on Earth enjoying the Alice in Wonderland ride when a couple of his fans were videotaping Biebs and the family. Upon noticing they were filming him and his family, Justin flipped off the fans. One girl screamed, "I follow you on Twitter!" to which Justin responded with a harsh, "F*** you!" 

Whoa Justin - that's no way to treat your fans!

Do you think Justin was out of line, or were his fans invading his privacy? What would you have done in his position?