"Start a fight in an empty room" springs to mind.
I think she'd get away a bit more with being perpetually abrasive, confrontational, bitter, and belligerent if she wasn't so spectacularly wrong, ill-prepared, and ill-informed as often as she is.
Still, I think you genuinely can get away with ranting and raving nonsense to an extent provided you are passionate and convincing at the same time. It is hilarious watching her confidently stick her own foot in her own mouth so frequently though.