I’m gonna miss dislike jokes (eg, "13 people just want to watch the world burn.")
It was nice to have a universal Youtube meme, if you post that the person who failed at Mario Kart "Never had the makings of a varsity athlete" nobody knows what you're talking about, or if you comment on a board game Let's Play video that "I didn't know this was a Red Coin level" again, straight over their heads. But everybody knows a number of dislikes reference. Whether it's "13 people just want to watch the world burn" or "9 Yoshis watched this video".