Oh, I like the suggestion of keeping the visibility of the conversation in mind. That's a really solid suggestion for keeping enough hope to bother responding, while not getting sucked into an endless and pointless argument.

I also realized after I wrote my other comment that I guess I already kind of do a "stock answer" thing, when TERF-y stuff comes up. I wrote out a long thing once about how, years ago, I had some TERF thoughts, felt bad, took the time to educate myself, and learned not to be an asshole. I realized that I basically had "How to Not be a TERF," so I saved it to my computer and now I post it again when it seems like people are either trying to figure out how to talk to a TERF in their lives, or starting to lean towards being a TERF themselves. Sometimes people respond and want to talk through stuff more, and sometimes there's no response, but at least it's out there if people find it helpful.