Different Kind of Complicated
The Joker missed the "good old days", just him, Batman, Harley, and the first Robin. He's grown tired, none of these new Robin's new how to have fun. Where was the banter? Where was the witt? He put time and effort into his traps and the birds gave him nothing to work with. It's fine, good old Uncle Jay decided to do something about it.
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Dick is de-aged to his mid-season one YJ self.
He's highly trained, been doing this for half a decade, and has the scars to back it up. He can't help but be underwhelmed by the attitude of his successors. But Dick doesn't want to deal with that because he's missing over a decade of his life all because of the Joker. He can handle older heroes underestimating his abilities, this is his typical tuesday. Everyone else might not get a choice in the matter as information comes to light that leaves them to rethinking some of their life choices.
Except Past-Dick, because as he inidicated before, they are a problem for Future-Dick.