I don't think they have to make Sherlock do anything, just highlight portions of John's blog (heads in fridge) and all the complaints of the Yarders on him being rude, that's what Moffat and Gatiss have said, some of Sherlock's behavoirs will now come back to haunt him.

Sherlock and John are now internet celebs, and you know how fast elements of fandom can turn on the things they love, I wouldn't be surprised if we maybe see some of their fans featured on the blogs turn against them.