There's an even more extreme condition called "gelotophobia," where people not only don't want to join in when they hear laughter, they are actively frightened and respond aggressively to laughter.
जिलेटोफेबिया" नामक हालत और भी गंभीर है" लोग हंसी में शामिल होना भी नहीं चाहते, वे हँसी सुनकर भयभीत और  आक्रामक हाे जाते हैं,