It's hardly widespread, but it's absolutely happened: https://www.youtube.com/watch?v=moWe3rk7LzQ

It started (in modern times) in the 60's at poetry jams. You can do it one-handed (i.e. while holding a drink) and you can also do it during a particularly impressive part of a performance, rather than waiting until the end.

Some groups have definitely taken it as a preference (sorry for the daily mail link, but it was the most succinct): https://www.dailymail.co.uk/news/article-3323166/Some-colleg... and tried to tie it to clapping as "triggering", but they're pretty uncommon.

One example of someone not-ironically actually stating that jazz-hands is better than the "triggering" clapping is the Oxford SU Woman's Campaign: https://twitter.com/womcam/status/580389025892175872

You can also

Meh.

In fairness, there are a lot of people, making up a lot of things on this discussion thread. It's kind of disingenuous to only call this poster out.

I mean, ideologues are gonna ideologue.

>In a statement, the University of Manchester Students’ Union said that they are not outright banning audible clapping at all school events, and are instead encouraging “the use of British Sign Language (BSL) clapping during our democratic events.” These events include meetings where members are invited to participate in decision making, the union said.