What makes this story political important is the way it highlights the Islamic penetration through international bodies. The OIC is commanding the UN human rights committee, thus avoidining any debate about anything that is harmful to Islamic interest, making it unhuman rights. This protest has no chance in the current UN, therefore it must be backed by social media.
It seems there is a difference between some Iranian women (most are socialized to go along with the rules and wear it without fuss) who revolting against the lack of freedom of choice and Muslim women in the West who are more than happy to wear it as defiance.
A Muslim woman in the West can avoide it (theoretically). Moreover, with the reIslamization and radicalization of the Muslims in the West, wearing hijab is political statement. Linda Sarsour, the chief Islamist propagandist in America and one of the organizers of Women March is connected to Islamic Brotherhood, so her choice to sport it is probably genuine and voluntarily. For Islamic Brotherhood agents in the west, the Hijab is extension of hijra (jihad by migration) and daawa (proselytism). These women in Iran couldn't care less about Islamic supremacy in the world.