Cause it is trolling, pure hatred. Hermaphroditism exists, simple scientifically backed up fact.

Hermaphroditism is an "exception proves the rule" kind of thing - they are not a third sex, and I don't think the "two genders" crowd hates intersex people or even men who claim to be women, but they do probably hate people who claim that it's bigotry to say sex is a binary.

Right, this is one of the games that trolls play which is kind of to search for normalizing language, create a provocation, and then relish in the attention derived from the provocation.