Trumpist fits, because Trumpism is a cult. If your friend thinks being called a "Trumpist" is pejorative, then maybe they need to rethink their support for a cult leader.
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This is a common thing in English. Both terms are technically correct but carry different connotations.
It's like the difference between "Forgive me Father for I have sinned" and "Sorry daddy, I've been naughty" both sentences have the same definite meaning, but wildly different implications
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