How do you mean his posture? Id like to take it in mind but just unsure what you mean.
Thanks for typo alerts. It still needs another editing pass.
It's subtle, so it may stand out more or less depending on the person. Early on he kind of establishes himself as a tough guy, like in the grocery scene, ex-military and all that, or he's pretty carefree lounging on the couch. Nailed that pretty well.
Later, like in the garage eating hamburgers, he's sitting on his feet which could be considered child-like or effeminate. I'd expect him to grab a couple stools or chairs or something, or squat down still standing on both feet, back to the wall for balance, and later when she's showing off her dresses, his stance is a bit effeminate as well, just how his weight is shifted and mostly supported by one leg. He totally could just be expressing his softer side in the more private moments, unlike in the grocery.
Kinda nit-picky but it did catch my eye and I'm only guessing at what that troll could have been referring to. I wouldn't overthink it.