1. Blame it on the psychologists who use the word dissociation to describe a continuum of stuff, from what you think of as “real” dissociation down to things that are totally normal occasional experiences for everybody. If somebody reads an authoritative-sounding informational thing that says “Most people experience mild dissocation once in a while, and that’s normal, but for a few people it’s more severe or more often,” it is not at all unreasonable that they would then use the word dissociation to describe normal/mild things.
2. It might help if we could come up with more specific words for things that are dissociation-ish but not exactly. It might also help if we could use the existing words for specific types of dissociation more often (e.g. depersonalization), instead of grouping them all together.