Both my husband and my daughter have a loose-hair phobia. Maybe not technically a phobia since they are not frightened of loose hair...they are disgusted by it.
I first noticed this in Mike when I had long hair. If I had a loose hair on my shirt, I would pick it off and drop it on the floor. Mike would freak out, get up, search until he found the hair, and throw it in the garbage. I thought it odd, but funny. (Is it just coincidence he finds short hair sexier than long hair?!)
Ever since Kaia was a toddler, and before she could even really talk, she would freak out if hair was in her food or on her person. She would hold out the piece of food, or her finger, and act as if there was a dead tarantula there that I must remove IMMEDIATELY or chaos would ensue. She could find the most tiny pieces of hair ever. If there was any sort of fuzz on her food or self, she'd find it. She is still that way. She hates to find loose hairs anywhere and will demand their instant removal, preferably to be burned or sent out to space, so she will never have to encounter them again.
I have seen both of them actually gag at the discovery of loose hairs in an unexpected place. They cringe when I drop it on the floor, where they could accidentally STEP on it, or worse, pick it up with their socks.
I am constantly surprised by what we pass on to our kids.