Indeed. I find that often (though by no means always) it’s interesting to find out why and how someone comes to believe something that, to me, is obviously wrong. The transition between “people are mad and stupid” to “there’s method to this madness” is interesting and useful, even if it doesn’t lead to “fixing the mind” of your immediate interlocutor. At the very least, it gives you a subject to think about later, to try and find out ways of fixing the beliefs of others, in future conversations.

(I often have insights on the correct, or at least a good, way of answering a fallacy quite a while after having a conversation. I can cache them for later, and sometimes get to use them in later conversations. Gathering such pre-cached insights can make you seem deep, which at least makes people more attentive to what you say.)