"checking the name of the writer Ooookay, this article about appearance is written by a woman. As was expected. It's probably not worth to read it..." If you thought something like this you confirmed how prejudices dominate our mind. And even if you didn't think something like that, you can't argue its importance away.

Ooookay, this article about prejudice is written by somebody who plays the gender card in the very first line. It's probably not worth to read it...

The Pygmalion effect, or Rosenthal effect, is the phenomenon whereby the greater the expectation placed upon people, the better they perform.[1] (Or the observer thinks it would be so!) A corollary of the Pygmalion effect is the golem effect, in which low expectations lead to a decrease in performance. (wikipedia)

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As Wikipedia says, this effect is difficult to replicate.

Majority influence refers to the majority trying to produce conformity on the minority, while minority influence is converting the majority to adopt the thinking of the minority group.[1] Unlike other forms of influence, minority influence usually involves a personal shift in private opinion. Minority influence is also a central component of identity politics.(wikipedia)

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Minority influence can be postive or negative.

Since what others think of you will modify your self-evaluation, your appearance will influence your self-evaluation, too. Also by direct feedback when looking in the mirror.

So?