What a stupid story. Robert knew who was cast and who he’d be doing his scenes with. He didn’t walk off the stage because of Mel. Whatever the reason, he’ll be back. The contract he signed will make sure of that.
I was about to say the same thing. You don’t suddenly start shooting a movie...and then suddenly find out who your co-stars are. If De Niro believes Gibson is repugnant, he would never have signed on to the movie to BEGIN with, especially because Gibson’s actions in question go back a few years. The implied scenario here makes no sense.