Synonyms for Belittling (same or very similar meaning)
WordNet sense 1 (a belittling comment):
denigrationWordNet sense 2 (tending to diminish or disparage):
deprecating, deprecatory, slighting, deprecative, depreciative, depreciatoryWordNet sense 3 (tending to (or intended to) detract or disparage):
uncomplimentaryFrom the ODE community, based on WordNetadd/edit