They flushed, however, when she burst into a shout of derisive laughter.
Lars von Trier's horror movie Antichrist prompted derisive laughter, some boos and lots of "Oh my Gods" during its first screening.
derisive laughter; a jeering crowd; her mocking smile; taunting shouts of `coward' and `sissy'.
derisive laughter, booing, etc