No one seems to care if entertainer Ewing Poteet dulls or excites taste for theatre. No one cares if he is foolish or brilliant, if he upholds theatre or sneers at it, if he knows how to write. The forty-four-year-old Poteet, in his seventh year as Item critic, is more than just his newspaper's theatre man. Most non-New York critics are the drama-music-movie-radio-television-nightclub-book-phonograph-art editors of their outfits. Fifty percent courts, 25 percent music, 25 percent theatre make up the 100 percent Poteet.