It can't be a symptom of sexism, else I could not ever be accused of harassing a man. Yet, could be capable of harassing a man, or a man harass me. Or one woman another. And power amplifies it, or squelches it (one rarely sees a superior get sexually harassed, but it's not because a potential harasser does not exist). Harassment is to me, more a disorder, at least that's how I have experienced it.