|"Are you a wizard or not?"
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Muggle supremacy is an ideology regarding Muggles are superior beings while wizards and witches are some sort of unnormal or even retarted freaks.
The Dursleys eventually led their son Dudley Dursley also into disgust of magic people, although Dudley's reluctance may primarily based on fear, not hate (for example, Dudley's first encounter with a wizard resulted in him getting a pig tail). While Vernon and Petunia often showed their strong hate toward the whole wizarding world, Dudley obviously do not hate all wizards, as he never insulted or bullyed someone just because that one had magical abilities.