"He knows about the otter and the hedgehog!how does he feel knowing millions of people think he's a hedgehog. Well according to Amanda Abbington, he laughs, he cries, and he curls up into a spiky ball for winter.
And when Molly tried to imply he only cared about John's opinions/concerns he quickly let her know she always counted too. So all we've really learned from this is, when pressed, he will be considerate of peoples emotions.
*SPOILERS* "Can we just talk about Martin Freeman? Like, we all just accept that John is so moved. We all go "awwww." But we can only do that because Martin Freeman is sitting there like a pro, BEING John Watson, making him real.