it isn’t a moshol or nimshal, it is an adage. And it explains what different people here are stating, that whether or not someone is right, degrading individuals, making fun of them and ridiculing them is not going to accomplish the things that are being claimed to be so crucial.
It will NOT wake people up to their faulty ways,
it will not make people think the other way is correct,
it will not do much but turn people away from those with the Torah derech because it is demonstrating lack of middos instead of demonstrating defense of Torah.
If the point of degrading the apikorsim is to deter people from respecting/heeding them, then the posters here are doing a lousy job of it. It needs to be done with intelligent words that will convey a love for Hashem and disgust at the attempt to destroy His Torah. Nothing resembling that is what is being demonstrated here.