TONY Award-winning actress Marissa Jaret Winokur was humiliated by a bunch of snotty Rodeo Drive salesclerks when she shopped for a dress to wear as a presenter at this coming Sunday's Tony Awards. In an episode reminiscent of the scene in "Pretty Woman" when Julia Roberts' call-girl character is humiliated by store attendants, Winokur found out a few days ago how a plus-size girl gets treated in America's chicest shopping spots. .............. Winokur went to Gucci, where she saw a dress in her size that she liked. But she was immediately told by the saleswoman: "Your boobs won't fit...