One of their most used tactics is to use the general embracing of what is right and good by the Right against them. "If yOu DoN't sUpPoRt xyz, yOu wAnT GraNdMa tO diE!!!", or whatever nonsense association they are using today. And of course, the Left is usually most guilty of that which they accuse the Right of.
Some tactics should never be used, but guilt by association, as in the OP, is more than a good idea. They need to be openly and constantly shamed for the policies and ideologies that they push. It would be very difficult to find a single policy of theirs that is not rooted in evil. They must be defeated.