There was a kid I knew once who was a huge fan of Undertale and talked about the characters all the time, but I know for a fact they never played it once; they received all of their information of the game through Let's Plays and lore videos and fan content.
It's actually a bit of a tougher question than you might expect. There are a lot of fans of big shared universes, namely Marvel or DC comics, who are just unable to devour the tens of thousands of issues of content required to become an expert. They refer to wikis and other types of guides to fill in their gaps of knowledge. But even further along, there are people who steadfastly love these comics and these universes, but have read next to no actual comics; they get their storytelling knowledge from movie adaptations, or lore videos on Youtube, or just reading Wikipedia plot summaries outright. Does that make them less of a genuine fan of the content? Not sure. Does it make them more shallow of a fan? Probably, but does that really matter?
My gut instinct is to say no, you can't be a real fan, or a real hater, of something without engaging directly with it. But I know my gut instinct is extremely biased so I'm not sure what to say.
One thing I am certain of though: You can't judge if a piece of media is good or bad without engaging with it, so all the whining Last of Us gamer boys really need to shut up oh my word it's been like two months