Sexism + all those "Bangali baba"s.
Bengali, apart from Malayalee, are the only 2 Indian matriarchal societies in my knowledge. That paints them already as a target for sexist forces.
It doesn't help that "Bangali Baba" posters and graffiti can be found from anywhere in Mumbai to a remote village in India. This aids in creating a stereotype.
Apart from all this, I'm surprised as to why they always target women for sorcery. In the west, a witch sounds worse than a wizard. Likewise in India, a daayan sounds much worse than an ojha or a baba. Also, alleged male practicioners are almost never targetted by mobs. They're always out to lynch witches or daayans.
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