A logical fallacy (part of ad hominem), when someone dismisses speaker's opinion and attacks speaker's personality just because she's wearing hijab/jilbab/niqab
Sometimes, this fallacy can go hand-in-hand with another fallacy like reductio ad hitlerum/Godwin's law (by accusing Islam religion or Middle East culture as racist, fascist, and such)
Example of reductio ad hijab:
You're wearing jilbab, therefore your opinion is discarded, and did I mention that your religion is a fascistic religion and spread through wars and conquests?
Insult, although not a derogatory term. Shortened form of "emak engkau hijau", which literally translates to "your mother is green". First found from a video of two Malay boys arguing in a park, with one of them proceeding to say the above phrase. Later scenes show them engaging in a fistfight.
This phrase has become the mother of all insults in the Malay-speaking world of the Internet, although some say in the SouthEast Asian world of the Internet as well. This phrase is popular among Malaysian netizens when foreigners say stupid things about Malaysia or Malaysians.
"Bodoh"
"Bodoh babi mak kau hijau"
Foreign politician: "Malaysia's COVID-19 situation is so dire that they bury the dead on the roadside."
Malaysian netizens: "Mak kau hijau"
This phrase origin came from a video that went viral in Malaysia about 2 kids was insulting each other. One of the kid spontaneously said "Mak kau hijau" maybe because out of words after being insulted and angry at same time. The reason it went viral because that phrase has no meaning of insult at all and it is funny when he said that. That is why netizens of Malaysian keep spamming each other with this phrase at that time more just like to joke with each other.
The phrase itself has no insult meaning but when foreigners comment something bad about Malaysia, they will get floods of reply "Mak kau hijau".