Ok, so on back on the subject of BRAT mary running interference
But here's the thing
it's not SAMUEL C. It's not JOHN.
it's Mary.
She doesn't want them to talk to each other because she knows there's a 99.999999% chance Samuel C will wind up telling John the truth about the hunting world.
///
AGAIN.
We actually see MORE of Samuel C's ire directed at having hunters in his house. He's weirder about hunters than he actually is about civilians!!!! He's... WORRIED about civilians, bc in his perspective, once they're in the fold, it's HIS responsibility to keep them safe.
(And as for hating hunters... we later see this bluster get undercut by Sam as more ready than ANYONE to jump into Dean's cause against the demon... and he gets killed and tortured for his trouble btw)
but yeah
i think samuel c is THE most onboard in the family to tell john the truth at this point
yeah mary...
that sour lemon look is specifically about LYING TO JOHN
not john himself
(later in s6, we'll see him slip into lying to dean ofc, but as was pointed out, that was post-Hell AND post-extreme psychological torture BY azazel
i actually think it's more in his nature, like dean, to tell the truth and hang his bleeding heart on the rack of whoever needs his help)
///
BUT ANYWAY What's the subtext of Mary's words here???
"My dad's just protective of me"
but actually
SHE'S protecting over JOHN.
John is her bby girl, her princess in a tower, her boy in a cheerleader outfit
she will be his knight in shining armor from behind the scenes if she has to, but preferably, she'd like to lock him in a super-safe bunker of suburbia, far away from the supernatural