The setup: Havok, the “leader” of the Uncanny Avengers, is meeting the Young Scott Summers from the past. At this time in his life, Scott doesn’t know much about his brother Alex beyond the fact that he has been adopted by a nice family.
Steve Rogers and the Avengers had gotten their asses handed to them in Australia, so he drags the Uncanny Avenger team to hijack the X-Men plane so that Alex can talk to Scott. Remember that these two are virtually strangers to one another, but when has not thinking things through ever stopped Steve Rogers.
When the two meet face to face and Scott realizes who he’s talking with, Rogers says this:
What a fucking douchebag! Even Thor and Scarlet Witch had to tell him to chill the fuck out, it’s brother stuff. Think about that for a second, the brother of Loki and the sister of Quicksilver have to tell somebody to shut up and let siblings talk. And they have tried to beat the hell out of their brothers before.
Then, when young Jean Grey reads the mind of Scarlet Witch and finds out about the MILLIONS of mutants she killed, she goes all Jean Grey on her ass. The situation is defused, but what does Rogers say then…
He is actively protecting the murderer of millions and just shrugs it off with “none of that matters right now”.
After making what he has to know are baseless accusations against the younger version of the guy who kicked his ass more than once and his friends, Rogers sends them on their way, then says this:
Havok just responds with “Yeah” but without any further context or word balloons. Personally, I like to think Alex was saying “Yeah” but thinking “Yeah, you would say that but this is the same guy that kicked your sorry ass so I’m pretty sure he had better days than today. Asshole.”