Well... when I saw an article saying that, I went to check the video. (It's like the saying "bad publicity is good publicity")
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When I watched it, I didn't feel like it was belittling them.
And I actually liked both the song and music video.
But well... I'm not blind or deaf, so I probably have no rights to say whether or not it actually is belittling them.
Whether or not they are belittling them, I think it wasn't their intention.
They just wanted to tell a story.
It's reminding me of when a kpop artist had recommended the book "Me Before You" by Jojo Moyes.
That book was controversial and many people found it ableist, but I don't think that the kpop artist condones ableism.