I shrugged it off the first couple of times. Which, if I say so myself, was big of me, considering this has been going on for twenty five years. I'm exceedingly patient, if anything.
Look, it's the age-old story of social media: your well-intentioned post with basic anecdote is the first time you bring it up, but the hundredth time the person you're responding to has been in this exact conversation. They're not snippy at you because they're trolling or arrogant, they've just been having a dozen people tell them the same obviously wrong exact thing every five minutes for a while and are increasingly unwilling to go through the motions.
That's a big, important lesson when you're trying to make an online space grow, if you want to be constructive about it and bring this little spat back to topic.