Participant heard this from a co-worker in 2022, who said it because a customer was upset at them for something they didn’t do. The participant now uses it for similar reasons, like not getting in between 2 friends fighting, or their siblings arguing over something small. 

Analysis: I see this phrase commonly online, mostly used as a response to something happening, mostly as a way to say “This isn’t my business, nor do I care” Similarly to the instance with the participant’s coworker, it’s also used deflect responsibility or remind oneself that they don’t need to help resolve every problem that comes their way.