Many people on the spectrum go through life with speakers blasting in their ears, wearing steel wool for clothing, and staring at the light output of a small sun. Additionally picking up on tiny flickers in sound and light.

So if your entire day is your senses screaming at you when you get home you kinda want dim lights and less noise.

I assume the image here is someone teasing a friend playing up a preference as a kryptonite-like substance.