TMZ has learned Mel Gibson exploded in anger last night on a college campus after an expert on Mayan culture accussed him of racially stereotyping the Mayans in the movie "Apocalypto."

It happened last night at Cal State University at Northridge in the San Fernando Valley. Gibson was speaking to a film class about his movies, and several members of the Mayan community came to hear the famous director.

After Gibson's presentation, the crowd was allowed to ask questions. Alicia Estrada, an Assistant Professor of Central American Studies at CSUN, challenged Gibson, asking him if he had read about the Mayan culture before shooting the controversial film. Gibson said he had.

Estrada persisted, stating that representations in the movie that the Mayans engaged in sacrificial ceremonies and had bloodthirsty tendencies were both wrong and racist. Estrada and others tell TMZ that Gibson exploded in anger, responding, "Lady, F**k off."

We're told Gibson also became extremely angry when members of the Mayan community protested on how they were portrayed in the film. The emotional Mayan members were escorted out of the room, and we're told Gibson screamed a parting shot -- "Make your own movie!"

UPDATE: Gibson's publicist, Alan Nierob, told TMZ, "This person was a heckler who was rude and disrupted the event, so much so that the event organizers had to escort her out." For the record, Nierob, not Howard Rubenstein, reps Gibson.