We should be thankful that a snarky Hush didn't decide to refer to him as "my old rent boy" or something.
See, that wouldn't be an issue, because we all know that's not true. Dini having Hush call Dick 'his ward' is problematic because the undercurrent is ignoring the adoption, and I'm left with not being sure whether that remark was supposed to tell us something about Hush's character, or whether Dini slipped up and forgot about the adoption, or whether there's a retcon going on...