A troll is someone who posts deliberately provocative content for the purposes of deriving shits and giggles from the outraged responses of others.
A propagandist is not a troll. A paid shill is not a troll. A person who sincerely holds views which you dislike is not a troll. Only a troll is a troll.
This being so, I’m not convinced that trolls are a significant issue at this point, although partially it’s getting harder to tell due to Poe’s Law.