Were people just stupid or something and not capable of knowing when the ambient light and camera is affecting the colour of the image?

WTF is this about people getting exact pixel colours?! The question is what colour is the dress, not the colour of the picture in which the dress is depicted!

Using pixel colour to determine the colour of a dress is like saying Martin Luther King had grey skin because the photo he's depicted in is in black and white!

For your information : the dress is really blue and black, according to the store and manufacturer. The vast majority of people see it as white and gold, but I personally think most people are not used to decrypting overexposed pictures, hence their inability to perceive the right colors.

Never understood this one, or believed anyone who said they saw black/blue. You can zoom in and colour pick, the colours are measurable and objectively gold and blue-white.

No, what happened is that a bunch of people were shown to be objectively wrong about what color it was, and couldn't let it go.