For example, I saw [INSERT NAME HERE] and they were looking like a total Munter. when it is used in a derogatory sense I think it is more often used when talking about [INSERT APPROPRIATE PRONOUN FOR PERSON WITH VAGINA HERE], but as far as I'm aware it can be applied to both/all/neither/X sexes/genders/species.
ETA: This is my second edit because apparently I don't understand how HN works after all this time. Mea culpa, mea maxima culpa.