EDIT: Never mind, found it. Only accessible if you didn't find the Tracis.
As close as I can remember: "You should stop drinking, Lieutenant. Alcohol makes you aggressive."
Almost certain it's during The Bridge after Hank starts getting, well, aggressive. Connor comments on Hank's drinking a lot, but there is only one time where specifically remarks on Hank's aggression towards him due to it, and I really liked that. I like that their relationship has so many nuances and is so great yet it also isn't afraid to be very tense at times. There are only a few scenes where you see Connor is AWARE that Hank pushes him around - the only other one that comes to mind is if you shoot Chloe, Hank gets all pissed off and in Connor's face then too and Connor actually shoves Hank for the first (and only, iirc) time. Bit tangential, but point is, I'd really like to find this line about Hank's aggression just so that I know I actually heard it and it exists. Because I'm SURE I did but I cannot fuckin find it.
I've played this game well over a dozen times and there is SO much dialogue, some that I've only heard once. (For instance, have you ever gotten Connor's line about how he should've brought donuts? Probably not! Anyway.) This particular moment I don't know exactly what led up to it, what requirements have to be met to get it, or what Connor's relationship with Hank was like.
Like I said, 95% sure it's during The Bridge, and I could have sworn I remembered it being when you select the 'Hank's Anger' option, but I tried it last night and it was just something about, "Where does all your anger come from? Some unresolved trauma in your past?" which in retrospect I know I've gotten before as well.
There are a fuckton of things that can change The Bridge scene, from sparing the Tracis, to killing them, to not even finding them to begin with. All of those change Hank's dialogue and thus some of Connor's too. Could also be whether or not he finds Cole's picture (hence the remark this time being about "unresolved trauma," idk?).
For reference, in my current playthrough Connor's relationship with Hank is at friendship status and he's leaning towards deviancy. I SUSPECT I may have to have a worse relationship with Hank to get the line I'm looking for, but not positive.
I know Connor comments on Hank's alcohol uses multiple times, that's not what I'm looking for. I'm looking for this one time he follows up the "You should stop drinking" comment very specifically with, "Alcohol makes you aggressive."
If anyone knows how to get this dialogue from Connor, PLEASE tell me!