A person who practices or advocates anglophobia; someone who promotes dislike or opposition to English culture.
From anglophobia + -ist (suffix forming practitioners or advocates of something). This rare term frames anglophobia as an ideology or practice rather than just a personal emotion.
This word barely exists in English, which tells us something important: we have language for people who promote admiration (anglophile, anglophilism) but almost no words for those who promote cultural resistance to English dominance.
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