The OP's article describes a Swedish school's overreaction to gender bias by forcing behaviour modification on students who display gender-conforming behaviour. This is an overreaction to gender bias issues both real and perceived. Ignoring the context presented by the article, emmapersky is advocating gender neutrality. They aren't advocating the forced minimization of gender differences; they want to end bias against those who display gender-variant behaviour.

Gender bias is present in our society along with the pressure to conform to gender stereotypes. Boys who play with dolls are often bullied by other boys and are socially rejected by their peers. Girls who don't dress the right way are bullied by other girls and are also socially rejected by their peers. In adult life, men who chose careers such as nursing are chastised for it by members of both genders. Women who chose professional careers are pressured forgo their careers to have children, again, by the members of both genders. To those who take gender-variant roles, this is a problem.

While there is a problem, some overreact to it trying to treat gender-conforming behaviour as a disease; as this example in the article:

  Hunter College psychologist Virginia Valian, a strong
  proponent of Swedish-style re-genderization, wrote in the
  book Why So Slow? The Advancement of Women, "We do not
  accept biology as destiny ... We vaccinate, we inoculate,
  we medicate... I propose we adopt the same attitude toward
  biological sex differences."

That is not a reasonable solution. Gender-variant behaviour should be tolerated instead of being discouraged. The article's conclusion agrees:

  There was a time when a boy who displayed a persistent
  aversion to trucks and rough play and a fixation on frilly
  dolls or princess paraphernalia would have been considered
  a candidate for behavior modification therapy. Today, most
  experts encourage tolerance, understanding, and
  acceptance: just leave him alone and let him play as he
  wants. The Swedes should extend the same tolerant
  understanding to the gender identity and preferences of
  the vast majority of children.

Postscript: Anyone engaged in the debate of gender bias and gender stereotypes should be aware of both their own and other's social biases[1].

[1] <http://en.wikipedia.org/wiki/List_of_biases_in_judgment_and_...;