"I would like to learn more about demons but I have noticed that people are hesitant to comment on this thread. Are demons something which are not talked about?"
The topic is too broad. There are a lot of things called "demons" and quite a few bear no resemblance to each other. Do you mean demons as "someone's speculation on what some author of legend meant", or "reports of demons as actual experience of something so named by the person having the experience", or "speculation about demon possession and exorcism as supposedly still practiced", or the "demon pokemon"?
In what way would a gargoyle be a demon? It's just a prop, isn't it?
Demonic or poltergeist energy.... somehow what you said reminds me of emotional contagion. It's a psychological concept.
I think there's more than one, meh. I have no idea. :)
I understand you have quite a history with such. I would love to hear more about it. Would you share one of your favourite stories (memories) with me please?