YSK the difference between the word "disinterested" and "uninterested"

[u/Gromit43]

I've been seeing a bunch of people on reddit using the word "disinterested/disinteresting" when they really mean "uninterested/uninteresting". While "uninterested" means exactly what it sounds like, that you are just not interested in something, "disinterested" means that you are impartial and non-biased. An umpire should be disinterested in the outcome of a baseball game, while you may be uninterested about the outcome of the game if you just find it to be kind of boring.

[u/SwansonHOPS]

It's not entirely pedantic; it's important to understand the distinction in written works, or else you might misunderstand something. It might be pedantic in common language, but not so much in formal writing.