Why do women consider super blonde eyebrows as universally unattractive?

[UncleJessieRabbit]

Some girls look cute with super very blond eyebrows. I know some may not, but why is there a near universal stigma?

[TurboKid]

Probably just a lack of contrast with the skin tone. I think it tends to become more difficult to read people's more nuanced facial expressions when their eyebrows blend into their skin:

[Jemini_Crocket]

I personally don't like it on girls (if they eyebrows are really really light) but I saw few guys who had them and I thought it's nice. I guess it depends on the guy as well.