The thing about Andrew and Kevin is Andrew believes that Kevin can't really be this spineless, and Kevin believes Andrew can't really be this apathetic, and they both resolve to poke each other with a pointy stick until they're proven correct. And then Neil shows up and instead of going hey maybe poking each other with sticks isn't getting anywhere he says oh look it's stick time and starts poking them both even harder. And then it works.
The thing about Kevin and Neil is that they're both perfectly aware that they're bad at being normal people, and that their genuine attempts at masking it tend to fall short, but each of them doesn't care about that as much as they do about the fact that the other one is doing it wrong.
The thing about Neil and Andrew is their feelings of dissociation from their lives and skewed sense of consequences should have led them to some form of domestic terrorism, except then they got too invested in enabling Kevin to remember that they can just do pipe bombs about the whole Riko situation.
