I'd buy this over any other explanation.
In a phenomenon known as the nocebo effect -- the opposite of the placebo effect -- people can convince themselves that something is producing harm.
I've spent some time near a few of these things and have only once heard the blades spinning and it's not that loud. If I was in a house with the TV on, I seriously doubt I'd notice.
These people are bombarded with RF and EMF all day long but somehow, this is ruining their lives?
Frankly, people with that weak of a constitution should probably be weeded out of the gene pool.