One very effective way to do that is through ridicule and dismissiveness. Although we should heed your warnings as deadly serious it is counter productive to confront liberals as though we take them seriously in all situations. Treat them personally as nothing more than children and objects of derision. It's ego shattering. They may redouble their efforts and respond with great anger but they lose a lot of advantages in doing so. We are the majority and we are the ones who hold the originalist view of America after all.
I agree Tiger.
Churchill composed the original formula on how to work against fascism:
Reveal the activity, Inform the public, Ridicule the perpetrators.
And NEVER back down.