(n.) One who hates.

Anglophobe Russophobe approver ass bitter-ender bug bullethead chauvinist diehard doctrinaire dogmatist dogmatizer donkey fanatic fiend freak hardnose hater illiberal infallibilist intolerant intransigeant intransigent jingo last-ditcher male chauvinist man-hater maniac maverick misanthrope misanthropist misogynist mule nut opinionist perverse fool pig pighead positivist purist racist sexist standpat standpatter stickler superpatriot ultranationalist woman-hater xenophobe zealot