http://www.nearlyfreespeech.net/ is willing to host anything that U.S. law allows them to, and makes more of an effort than most hosting companies to keep anything up that they can, and requiring that proper legal procedures be followed before they'll take things down (policy: https://www.nearlyfreespeech.net/help/abuse). That would cover your "brand X sucks" example most likely, though perhaps not others.