This isn't as something as simple as changing Kirk's middle initial. This is a fundamental change to a beloved character. Who is Tim Drake? Time Drake is the third Robin. That's how he was introduced. That's how we was for most of his existence. To suddenly strip that away, and say that he was never the character the he was is insulting to all of the fans.
They've been doing that since 1938, too. It's not really that big of a deal, all they've done is ad "Red" to his code name. He's still a Robin.
You've a low threshold foe "insult". I've followed Tim Drake since Batman #436. He's probably the best take on "Robin" I've read, but I cant make myself feel "insulted" over a few changes.