The ‘Stars of the 21st Century,’ an annual gala that returned on Monday to the New York State Theater at Lincoln Center ought to offer much but delivers kitsch. “At fault is the vulgar attitude toward dancing displayed in the so-called “defilé,” where all the gala participants leap and twirl, performing stunts like animals in a circus ring. The tastelessness of this finale, which spoils the curtain calls each year, has begun to leach into the gala proper.”