The decision was made to keep the University of Manchester compliant with a 2015 vote in the UK's National Union of StudeBut students also noted that loud noises like "whooping" or "traditional applause" can create problems for students with anxiety.
According to the Guardian, the MSU motion said that "this union notes that since 2015, the National Union of Students (NUS) has been using British sign language (BSL) clapping (or ‘jazz hands’), as loud noises, including whooping and traditional applause, can pose an issue for students with disabilities such as anxiety or sensory issues."
- Source, Zero Hedge, read more here