People view the image in different conditions. There's so many factors involved. How bright your surroundings are, the make and size of your display device, how you perceive colors. Professionals perform color grading to avoid ambiguity like this in movies and such. Even your cultural expectations are hypothesized to change how you perceive the dress. (Eg. living in a desert environment can make you expect more yellow shading)

There's a similar illusion called the spinning dancer, where some people simply cannot see the image spinning one way or the other, while some can even switch between them. There's more information in the dress to make an objective assessment, but if that information isn't observed or obscured by the aforementioned reasons, it's totally understandable. That's what OP's image is showing.

[–] thedirtyknapkin@lemmy.world 3 points 4 hours ago* (last edited 4 hours ago)

Exactly lol. The rest of the scene had clear context that the image was overexposed and the white balance was too warm.

Anyone that understands photography instantly understood what was happening in that image. I've had people try to fight me and tell me I'm wrong about that, but I've been a professional photographer/videographer for over 15 years. Quickly identifying a technical issue with an image like that is like breathing to me. I do it every single time I take a picture, so over 10,000 a day on average. All I can say is trust me. that image was overexposed and too warm, You can tell by the way it is in the background, and if you can't see that then my words won't help you.