Liberals always resort to name calling because they have no basis in fact for what they say. Liberals never listen to facts, they only care about their views. You can't fix stupid, so don't waste your breath trying. My response to them when they hurl accusations is always:
"That would have hurt, IF ... I valued your opinion."
Most of the time, this results in a pause, followed by stuttering because they really don't know what to say.