I would ask about new cars, you never could know if a demonized person had assembled part of the car or made the dress/pants you wearing.
I can understand this thinking in a culture/community founded on the belief of demon possession. But not too many in the US take this seriously. They don't view horror films as documentaries.
As to thrift stores and garage sales, the view as used anything being purchased being demonized is painting yourself into a corner.
When I went to "pioneer school," when we went out to practice the things regarding talking to people at the door, we had to go with one of the instructors for part of the morning or afternoon. As we walked along, I saw a garage sale up ahead. One of the sisters in the school, was very vocal about demons and garage sales. It happened she and her partner were working across the street from us. As we reached the garage sale, the instructor looked at what was for sale, picked up a couple of things he knew his wife would like and that a friend would like. Went up to pay for them and just mentioned that we were jws in their neighborhood. Complemented them on the well run sale. And that was it. Later, I saw that woman go up to him to chastise him. He pulled aside out of earshot and quietly talked to her. She stormed off, but later was a lot meeker in the afternoon.
I have found there is at least one person who gets attention when she/he makes themselves the center of a "special" demon event. It is sad that anyone would have to do that to be noticed. The problem was she had an influence on some who thought if you did not have a demon experience, you weren't doing enough and satan did not see you as a worthy target.