I think the important thing about going dark/dim is that you don't initiate contact, or very little, but when there is contact, you act as if, stay upbeat and positive...like nothing is bothering you.
You can go dark/dim without it coming across as sulking, or being passive agressive. It's more about how you act when there is interaction, then it is about avoiding all interaction.
FLoyd The grass is always GREENER over the septic tank.