Popper is indeed the best articulation of the caveat of the OP. We must be intolerant of intolerance. And intolerance is defined as ideas that attack others bas

Popper is indeed the best articulation of the caveat of the OP. We must be intolerant of intolerance. And intolerance is defined as ideas that attack others based on inalienable aspects (skin color, lineage and the like) or intrinsic to our understanding of self determination that does not impinge on the rights of others (religion, beliefs, sexual orientation and the like).