I interpret the flag to mean "spam" or "offensive", not "This story doesn't interest me". That's why you are getting down votes. If you don't like the story, don't up vote it.
Flagging things that are not spam or offensive either wastes mods time or raises the bar on what it takes to flag actually offensive things off the site.
I'd add "incorrect / misleading" to "spam" or "offensive" which is why I originally flagged it. "Doesn't interest me" would simply be expressed by not upvoting.
Flagging things that are not spam or offensive either wastes mods time or raises the bar on what it takes to flag actually offensive things off the site.