Because the creator himself specifically addressed the headline in the article. So either you think you know better than the creator, or just saw the headline and knee-jerk wrote a comment without reading the article contents.
Saying "You don't need a PhD you just need to believe in yourself", or whatever, is fine - but it's not related to the article, so gets down votes.
The headline is part of the article. You could say “so you think you know better than the author” by quoting the body or “so you think you know better than the subject” by quoting the headline. Both are quoting the article to react to other parts of the article. The fact that the single most salient and most read part of the article sucks is plenty worthy of criticism.
Saying "You don't need a PhD you just need to believe in yourself", or whatever, is fine - but it's not related to the article, so gets down votes.