If all the bullshit in this world were real, then we would need ten mile long snorkels just to breathe.
The beauty of this saying is that almost everyone (who understands it) will agree with you.
But, of course, there's a problem.
The problem happens when you start to define exactly what the bullshit is.
Then you learn about that other saying:
No one agrees about everything.
and everyone disagrees about something.