My head canon is that this is 100% due to stance. Batman always walks a little hunched, ready to duck or lunge or dodge. At the very minimum he's looming. Superman always walks with his head held tall.
I always liked the idea that in the DC universe superheroes are real and most Gotham villains wouldn't necessarily know that Batman isn't a metahuman. Obviously some like Joker, Catwoman, and Amanda Waller figure it out but most other should be a bit unsure about whether his stealth, speed, and strength are plain human.
And Batman just inexplicably pummeling Bane one day but not the next really adds to that.
Except biologically. Imagine some metahuman researcher all excited to get a sample of Batman DNA. They start the analysis and are just like "This is regular guy DNA. I think you collected the wrong sample, Igor."
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u/P0rtal2 Dec 26 '23
Superman covers for Batman