Aggression and building rapport aren't mutually exclusive - a lot of this is subtle negotiation for relative status. Just because all parties are okay with these as a way to get to a reasonable common ground (and if done right, can lead to strong rapport and relatively equal status) doesn't mean aggression isn't there. I don't think most of this is conscious, but you will also see conspicuously high-status people use self-deprecating humor to lower their perceived threat level, or conversely, people targeting other conspicuously high-status or threatening people to take them down a notch (to some extent, this is what we're seeing here). Or in a more hierarchical situation, high-status people might target lower-status people to reinforce their higher status.
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