Hate to break it to you guys, but the lore or backstory for the Haunted Mansion is super thin and often bends to whatever project they are working on.
These kind of posts too often feature condescending openers.
You are not teaching anyone anything by saying HM does not have a rich backstory. It is a retirement home for ghosts and we are on a tour.
What it does have with that, is the art of the reveal like the many great magic tricks and world renowned shows of the world. It has intentional art choices that are well documented and studied.
Aspects of this choice, finished that for many, conscience and subconsciously. If it is no concern of you, no need to discuss or disagree until you belittle or hope someone agrees with you.