two people who are soulmates in the sense that they become so annoying when interacting with each other that no one else would put up with them.

"You do not make history. You can only hope to survive it."

"G'Kar, you are a depressing person."

"Thank you!"

He's entirely capable of being inappropriate when talking to literally anyone, we've definitely seen that with him at other times, but he's definitely in a different mode when he's talking to G'Kar, at this point in their relationship trajectory, and you can see him become noticeably more toned down with Vir.

Yes! It's outrageous, but it's not scattershot. It's particular to the two of them.