Probably because "Houthis" is a name that readers will understand—and because there is no rule that says we have to call people by the name they call themselves

Probably because "Houthis" is a name that readers will understand—and because there is no rule that says we have to call people by the name they call themselves. Is there any evidence that "Houthis" is a disparaging name? While you're worked up about bigotry, you might be interested in their slogan, which I just learned from Wikipedia: God is the Greatest Death to America Death to Israel A Curse Upon the Jews Victory to Islam