Feiglin didn't call for genocide. He called for something pretty reprehensible but certainly not genocide. But yes, there are people in Israel calling for genocide and they will garner attention. Fact remains that Israel hasn't committed genocide and yet people still accuse it of doing so.
Those same people, and people who believe them, then find it very hard to understand why the media and people in power are not acting as if a genocide is going on. Rather than rethink their understanding of the situation they go on about a conspiracy to not let the world know the truth. I guess it must be kind of exciting to think that you're part of a small number who really know the truth. But it cannot be healthy mentally to live in such a fantasy world.