1. people - usually older adults - breathing really loudly.
I'm not angry at people for breathing as audibly because it seems that genally, they cannot help breathing heavily. I cannot stop hearing it/can't shut it out however and sometimes, I'll hear it even over listening to music on headphones. It's distressing to be forced to listen to someone's heavy, squeaky and possibly irregular breathing on a train or bus.
While the ticking of an analogue clock is similarly distressing, at least that ticking is regular, unchanging in volume and therefore entirely predictable. Also, I get goosebumps from hearing some people chewing really wet-ly but unlike breathing, I know that the chewing is bound to stop sooner or later.
2. the high buzzing sounds lights and electronic devices, as well as chargers/power adapters make
I hear the buzzing sounds with a lot of lights and devices and they drive me mad.
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett