I'll take a minute to respond here. Would you rather live in a world where people admit they made a mistake and thanked people that pointed it out or one where they didn't? You just sent a reward signal to the 'don't ever admit your mistakes' world in case you didn't realize.

It’s also fair to say that there’s another possible world you haven’t mentioned: one where you’re both right.

In such a world, you would have looked it up before posting, and your comment, their reply to you, yours to them, and mine to you, wouldn’t exist.

Perhaps they were trying to send a reward signal to all of us in this thread in order to induce a shift from where we find ourselves now in order to arrive upon the “look it up before posting” world line?