This is a quote from Carrier that Loftus sometimes quotes.
By and large the minds of the ridiculous can't be changed. It's their flock we're talking to. But even the ridiculous change under ridicule some respond by getting more ridiculous (and those are the ones who could never be swayed even by the politest methods), but others accumulate shame until they see the error of their ways (I've met many ex-evangelicals who have told me exactly that). Thus, ridicule converts the convertible and marginalizes the untouchable. There is no more effective strategy in a culture war
Even if you accept Carrier's arguments for ridicule, it has the downside that the presence of ridicule is inductive evidence that the person doing the ridiculing isn't going to work very hard to get anything right about what his opponents have said. If you found someone who ridiculed their opponents while at the same time tried very hard to understand those same opponents, that would be remarkable.
Where there is a lot of intellectual distance between parties, it's hard work just to clear away the misinterpretations and get down to figuring out just what the real disagreements are. The temptation is to throw out a clever put-down when you should be trying to get the opponents position right. The defense of the ridiculed against the ridiculer is typically, 'You don't understand what you're ridiculing." So long as I have that defense, ridicule is not going to be very effective.
What ridicule is effective at is rallying the already converted. Listen to Rush Limbaugh for an hour and see if it doesn't help you get the point. (Or, find some less torturous way of doing it, if you find that painful).