[zdragnar]

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

[ssully]

Yeah I’ve definitely been to events where quiet or no clapping is preferred (ex: poetry readings) but the OP claiming we aren’t aloud to clap at events anymore because it’s too violent sounds like someone who hasn’t actually been to a public event in the last year.

[colpabar]

I'm sorry you misinterpreted my comment to mean all public events in existence.