Spike Lee is an exhilarating blend of brilliance and bravado, of creative individual, professional and preacher. In his stylized visions of our racially tense humanity - the small-scale sexy comical presentation ''She's Got to Have It,'' the inventive melodious ''School Daze'' and the astounding political and lesson drama ''Do the Right Thing'' - he dares viewers and the Hollywood establishment to hold up with his honesty and wit, his passion and visual flair.