Sometimes saying it is passive aggressive, sometimes aggressive, an attempt to deflect an emotionally hard situation. "I don't want to get into this with you."
Sometimes it performs a shift in the intensities of a conversation. As in "let's not escalate, let's establish a ground of conviviality." Or, "this isn't worth fighting about."
Sometimes it is said ironically, when nothing is good but in everything rots in equally bad ways.
Sometimes said non-ironically: everything has its place, everything has it's purpose, it's all good. This is when it can become a pedagogy opposed to the usual registers of CRITIQUE.
So whatever it is, even if its aim is to calm a nerve, even if its claim is descriptive, the phrase wants to be performative, to shift the emotional ground, and states a desire: it wants effects.