One of the odder changes in the behavior of people on the left in recent times is going from "I'm a person, not a label" to "Look at all the labels I have!"
I don't think it ever got to the point of "we aren't ever allowed to clap at events", but it certainly seems like there were people who were pushing for that
>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.
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.
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.