What is this phenomenon called?

Some people can’t stand to wear socks, because the seam irritates them so badly. Isn’t there a name for it, or is it a mental thing?
A FB friend said her daughter just won’t wear socks because she can never get the seam straight.
I had a little girl in my daycare that complained of the same thing. Her words were “I’m having a reaction in my shoe.”
You know how kids pick up on things. Around that same time my son and I were sitting on the couch and he said, “I’m having a reaction in my pants!” I almost fell off the couch laughing!