I limit my contact with people to avoid too much anxiety, so it's mostly people's incessant noise that annoys me the most. I just can't understand their aversion to silence; music blaring all the time, over-revving their car/bike engine for no reason other than for attention, shouting when they could easily just have spoken, talking when they have nothing to say or are repeating themselves.
That's why I like the night-time, when they're all unconscious is the only peaceful time when my thoughts aren't constantly being muddled by the racket.
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When you are fighting an invisible monster, first throw a bucket of paint over it.