Kate Beckinsale is revealing a new Harvey Weinstein horror story, claiming he once berated her for dressing "like a lesbian" at a movie premiere he insisted on having in NYC ... shortly after the 9/11 attack. Kate says Weinstein, who was head of Miramax studios back then, forced her and the other stars of "Serendipity" to attend a premiere in early October 2001 -- a move she called "insensitive, tone deaf, disrespectful," because the city was still smoking and people were searching for loved ones. As a result, Kate dressed very conservatively ... opting for a white suit and tie.