Having the victim re-tell the story to blame himself/pretend it didn't happen and never revisiting it again does seem really weird.
Does he ever specifically mention him and Tarantula on the roof after Blockbuster was shot, though? I know we did get Bruce chastising Dick for losing sight of the value of his life, but you would think if Bruce knew what Tarantula did to him, he'd react a bit differently. Like emphasize to Dick that he shouldn't be feeling guilty, and then go and personally see to it that Tarantula is arrested for anything and everything he can get proof on, you know?
Especially since part of it is people wanting it not to have happened, yet being unable to forget it happened. And another part are people who really do believe that Dick, as a man, could not be raped so his after-the-fact retcon is accurate to them.
Yes, this. Not dealing with it afterwards either leads to downplaying rape and sexual assault (with the added false implication that men can't be rape/sexual assault victims at the hands of women), or not acknowledging something that happened to the character.