Barilla’s turnaround from homophobia to national pride.

(Image: PHOTOGRAPHER: BOBBY DOHERTY FOR BLOOMBERG BUSINESSWEEK. PROP STYLIST: MICHELLE GATTON)

On a warm September evening in 2013, Claudio Colzani drove his Audi the 100 or so miles from Milan to Parma, home for almost two centuries to the world’s largest pasta empire. He had joined Barilla SpA as chief executive officer less…