From my experience, our memory can't always be trusted. Unless a person has perfect recall or a photographic memory, they will forget a lot of things and details. I think that if a person has a bad experience on something/place, then their memory of it can get worse than what it actually was. The same is true for good experiences. That is why when people go back and visit, it isn't really as bad/nice as they remembered it. Of course there are always outliers.