Since you didn't say who A, B and C were I have to assume,
A - person to the left
B - person to the right
C - Adria
Yes, you have missed the distinction and the twitter "analogy" is false.
Adria[C] (I've no idea who any of these people are) turned and spoke to the person to the far left [A] behind her - and it "involved forking the repo to continue development".
Then, the "guy next to him" [B] .... um, the 3rd Person [B], began making forking jokes.
So how does [B] have an active relationship to [C]? (Speculation: [B] thinks there is a relationship because they are sitting next to [A]?)
Now we have to introduce [D] -- the traveller inbound to the USA. The "socks in pants" sexual innuendo is between party [D] and [C]. Party [D] tweets about the TSA, party [C] responds.
Where is [B] or other letter if twitter is supposed to be analogous? Being an observer or a passive listener doesn't count!