Yes, I disliked the video after I watched the trailer. The whole point of the dislike button is to let whoever posted the video know that I DISLIKED it.
I don't care who they cast as Ariel or anybody (OK I did want Queen Latifah as Ursula, but aside from that...) all I care about is that they actually deliver a good film. I love anything to do with underwater, so I was kind of looking forward to this and then I see the dull, colourless trailer with the only saving grace being a potentially good cover of "Part of Your World". Why should I be criticized for disliking the video? Granted, some of the dislikes are probably people pissed off at Ariel being played by Halle, but that shouldn't invalidate all of the dislikes.
There's no way to accurately judge which dislikes are from people that just clicked the video, hit dislike, then left because they hate Halle as Ariel. My point is that the dislikes shouldn't all be ignored and treated as "racist", when a good portion of them could be from people that have valid criticisms of the film. Mulan had dislikes because of no music/Mushu, Aladdin had dislikes because Genie looked horrible, the list goes on and on. The amount of dislikes may not be on The Little Mermaid's level, but like I said before, The Little Mermaid is one of DISNEY's top IPs so obviously more people will be paying attention to it.
My point is really that DISNEY shouldn't discredit all the dislikes as "racist" and hopefully take into consideration people's criticisms of the film and make adjustments accordingly. One of my biggest issues, rewatching the trailer, is that it doesn't even LOOK/FEEL like Ariel is underwater. There's barely any particles floating around or bubbles.