refrigerate after opening

My Ex- girlfriend used to have a pantry full of food consisting mostly of expired or redundant items. After we started dating, I suggested she organize and throw away some items to make more room in the pantry so I could leave some cereal there. I was helping her with this and noticed many items which could have been in the refrigerator in there. I asked her why she couldn’t just put them in the fridge. She told me that she could, and proceeded to open a jar of salsa, and then put the cap back on and put it in the fridge. I asked her why she did this, and she told me that the jar said “refrigerate AFTER opening”.
Sometimes I wonder how people can get through their lives carrying on with this sort of misinformation. I’ve tried to think of something that I believe is true that may not be, but I can’t think of anything. Another ex once told me that I shouldn’t not believe in something just because it doesn’t make sense. I say screw that- if it doesn’t make sense, you shouldn’t believe in it. I am an analytical person. And I deal in reality. Get used to it.