I disagree with this because for that person their perception is reality, fact, and belief rolled into one. Proven facts may state otherwise, but until you can convince someone of those facts' reliability, what they perceive is real to them. The realiability of stats poses problems of their own. Think of the studies that prove Item A is correct and then several years later we learn Item B is correct while Item A is wrong. There are also studies with an inherent bias or outside influence and all of these influence statistics or a narrative. One great example is the FBI's data on violent crime. We know it to be incomplete, but those are the official US Gov't numbers. Does unreported violence ( with respect to the FBI) drastically change the FBI's numbers and subsequent conclusions? We don't know and can we trust what outside agencies or studies present?
Perception also "allows" us to cherry pick studies or numbers that support our beliefs. Black people are inferior to white people? Use crime statistics or high school graduation rates (I'm spitballing, I don't know the actual numbers and this isn't a meme so fact checking isn't allowed
) to support your beliefs. Dredge up a study from 10 or 20 years ago....any scenario we can conceive of to support our perception.
To a person what they think they see is what they see and believe. Those are the only "facts" that matter to that individual.