Stop being condescending. The truth will always prevail. Start using simple facts and let them decide for themselves. This is is only way. Those who cannot see, will never see. Move on.
"The truth is like a lion, it needs no protecting. Let it roam free and it will survive."
I'd also say, I reached this point by my own accord, not because someone shoved it down my throat on a daily basis. I freely chose this path.