You are not immune to propaganda. That includes Liberals, Socialists, Communists, and Anarchists as well.
In a Bourgeois Democracy, where the media is privatized and the Bourgeoisie controls the outcome of elections via manufacturing consent, it is easy to think you see past it all. But, you don't.
Propaganda works in layers. You can notice one layer, laugh at it, and fall for another. In a Bourgeois democracy, this can take the form of controlled opposition, like the comprador CPUSA, or it can take on the form of less than establishment media narratives.
Finding the truth of the matter is what is important.