While I think snyder took dc seriously I think he might’ve took it a little too seriously.

"I kinda came to the conclusion also that they couldn't really talk in their suits, um, with any credibility..."

"... more than 4 or 5 lines and you start to notice, like wait, these are two guys ... one guys dressed up like a bat and the other has a big red 'S' on his chest, and they're being super serious about how mad they are at each other..."

He also said at one point said Lex finding out Superman's identity doesn't need explanation because the concept of secret identities is ridiculous.

Like both Nolan and raimi had multiple moments of heroes in costume’s talking. Even snyder had watchmen where majority if not all of the conversations between heroes is in full costume. But for some reason he just didn’t think it’d work for dc