contemner

noun

1. One who contemns, who displays contempt towards another.

   “Præsumptuous violators or contemners of the sabbath or holie exercises /.”

   “I have read a fiery gospel writ in burnished rows of steel: / “As ye deal with my contemners, so with you my grace shall deal; / […] ””

   “From all of which Isabel gathered that Lord Warburton was a nobleman of the newest pattern, a reformer, a radical, a contemner of ancient ways.”