[Guzma does indeed expect some sort of dig, some angle of superiority from Archie because Guzma's a fucking dumpster fire of a mess--but that's less based on how Archie is as a person, and more on how he's used to being treated. It doesn't come, and that's likely why his expression relaxes. He's silent as Archie continues, explaining his own terrible treatment at the hands of his own society.

Those in power unwilling to listen, unwilling to bend, unwilling to change. Guzma's mouth purses into a thin line, and his gaze shifts away from him towards the end. He gives a brief nod in agreement.]

...Why d'ya think I knew I could rely on you, hm?

[He shrugs his shoulders.]

You get it. You know what it's like--to be treated like forgotten garbage, to be looked down on 'cos you ain't what's "normal", no matter how fucked that "normal" might be.

To be made into the "bad guy", 'cos you're different, 'cos you ain't willin' to play along by their rules--their expectations. These heroes-these self-important douchebags who ain't got a clue 'bout what we been through, what it's been like being us in a world they can't fuckin' fathom...

[Guzma's face scrunches with annoyance and distaste, before looking back at Archie once more.]

That's why I trust ya. You're part of Aegis, but you ain't using that shit to keep no one under your foot, you ain't actin' high and mighty, 'cos you get it. You know.

Dudes like Darin? That idiot don't know shit.