It all went down at LAX — when James walked past a man holding an “Avatar” poster, and refused to sign. The man went back to Cameron and asked again to which James replied, “I don’t owe you a f**king signature … just get out of my f**king personal space.”

That’s when the fan lost it and replied, “I’m an asshole because I ask someone I admire for their autograph that makes me an a**hole? I make $15-an-hour at work to go see your film and I’m an a**hole?

Ultimately, James calmly walked away from the situation while the fan continued to yell at him.

..While a group of Hindus are up in arms because they claim the title disgraces their religion. The Universal Society of Hinduism and its president Rajan Zed are demanding Cameron put a disclaimer before and after the new 3-D flick saying it has diddly squat to do with the Hindu religion and its concepts … and the title is just a coincidence.

The concept of “avatar” — commonly known as incarnation — is a central theme in Hinduism and prominent Hindus are worried the movie will completely botch it if Cameron doesn’t bother to explain himself.

Ironically Cameron’s film will reportedly be the biggest ever Hollywood release in India.