abominator

An abominator is someone who abhors or detests something utterly.

The word carries a sense of moral revulsion rather than mere dislike—an abominator doesn't just disapprove but finds the object of their scorn loathsome or offensive to their principles.

He was a lifelong abominator of hypocrisy and pretense.

The term is somewhat literary and old-fashioned, more likely found in Victorian prose than contemporary speech.