ABSOLUTELY NOT!. I'm a minority and I love Seinfeld. I hate people who never watch the show but constantly complain about it for the attention (ie Manny from the Puerto Rican rights group). Although none of the main characters is a minority, the show has always included people of different races (ie Ping, Ba Boo Bat, Ramon the pool boy with his Filipino co-workers at the health club, maroon Golf driver, Jackie Childs). Seinfeld has also included groups of society not equally represented in television: Mickey (Kramer's lil' buddy) and the deaf babe that Jerry dated.
As Jerry once stated so eloquently: "LOOK TO THE (black and white) COOKIE!"
Who's your daddy? - I'm your daddy...