WELL, at least the Dixie Chicks have the Canadians on their side. After Tuesday's premiere of Barbara Koppel's documentary about the Chicks, "Shut Up and Sing" - which is about how their fans revolted after Natalie Maines bashed President Bush two years ago - Toronto Film Festival managing director Michelle Maheux said, "This country would never allow something like this to happen." While the Canadian crowd ate up the movie, conservatives were riled up again - specifically with lead singer Maines, who calls President Bush a "dumb [bleep]" in the film. "What a fascist little bee-atch!" said one angry post...