I got up right next to the faces, without look at them, and pointed at them and started LAUGHING, RIDICULING, SMILING, in a loud voice drowning THEM out, saying things like "what a joke!" "That's funny, you gotta be kidding" , "Oh realllly??? har har har! Tell us another one!", deep loud belly laughs, and continuing to make fun of them. Made fun of every single thing that came out of their mouth. The departing crowd at first look confused as they could not figure it out. Staring at the scumbags, then at me, and back at the scumbags, and then back at me, confused looking. When this protest started, they initially had been met with angry, red conservative faces, almost all of them to a person, a few, mostly the women, looking down and just shaking their heads. But after about two minutes of this ridicule and not directly attacking (directly trying to counter or threaten), these leftists' chants got weaker and weaker and less assured, they looked TOTALLY puzzled at me, their faces became somewhat noticebly upset (and they had been smiling ear to ear when they earlier had been getting precisely the response they wanted from the crowd which was middle fingers, thumbs down, jeering, and some possibly jockeying to assault them), and they eventually furled up their offensive signs and left with heads down and nervous, forced grins, when the rest of the crowd started LAUGHING at them, too. They were laughed right out into the parking lot.
This was about 15 years ago. There are tactics that work to disarm these types. I like the "infiltrator" sign as well, with the arrow. Brilliant.
Peaceful protest is your right. Do not let these lies deter you...trust me, the lies will just keep coming. But the more people who come to the protest...the more who will learn that all these lies are manufactured by a corrupt few.