This is the most disliked YouTube video of all time with over 18 million dislikes (as of March 2021)
In order for this video to become the most disliked video ever, people actually like the former most disliked video, Justin Bieber's Baby, so that the like to dislike ratio would go down while the dislikes for YouTube rewind went up.
Youtube Rewind 2018 is one of the only Youtube Rewinds to miss out on most important things that happened on Youtube.
Unbeknownst to YouTube, YouTuber Jaiden Animations sneaked in an animated cameo of PewDiePie's chair after PewDiePie wasn't asked to come back for 2018's YouTube Rewind. This earned Jaiden Animations respect among the internet and PewDiePie himself, even inviting her to his wedding (to which she happily attended).
With over 18 million dislikes, YouTube Rewind 2018 is the most disliked YouTube Rewind of all time. The second disliked YouTube Rewind is the one made in 2019, with just over 9 million dislike. Most of the others vary between around 8 thousand to 2 million.