As much as I'm happy with how Bern burns Yuri, he just seems way too cold there.
If he's worried about public's eye, the damage already done the moment he agreed to sneak together with Yuri.
And he didn't even try to listen to any word from Yuri, like, at all.
I mean, Yuri is still innocent so far, man, at least in surface. Like, Iris' banishment can be seen as Ed's overreaction rather than Yuri's scheme, and she calling out to Bern can be seen as actual concern for Bern caused by Bern recent tendency to separates himself from her group.
He just seems too harsh on someone that can be passed off as mere ditzy with good intention.
She's not actually a ditzy, of course, but Bern doesn't know that, does he?
Also, that moment when Yuri's real emotion slipped through when she missed the meaning of Bern sarcasm is just way too good, man. Can't imagine her face when she realized it's a sarcasm.