Sounds like the school has ASD students who are particularly noise sensitive and they are doing a small thing to help them.
I don't want to be a dick here because I have Autistic family and work with the same, but this does vary a lot, some ASD kids wander around clapping all day, some only react to entirely unexpected noise.
Had the school stated this was the reason, then maybe OK, but really they just wanted to accommodate a single teacher.
SJW safe space terminology
Exactly, this is why decisions like this are dangerous,
If we accommodate an individual by changing the behaviour of the majority, we are distorting how things happen in real life and thus the development of any coping mechanisms.
This is then one step away from changing the behaviour of the majority because someone is "offended".
Behind issues like these is a cynical political theory that actively seeks to create victims out of these individuals - which then requires the State to protect them via legislation - this then becomes an over reach of State authority and a co-dependence on that State.
Nobody gains political power by staying out of your life, they do it by becoming a symbiotic part of it
It might superficially look to be progressive, but really idiocy like this is only empowering a mass of useful idiots and creating Generation Snowflake.