My brief translation …
A guy accidentally wandered into the bathroom where his sister in law taking showers.
SIL: You have done an unforgivable sin against your brother.
That guy was stunned and wanted to leave immediately.
SIL: You are not doing me a favour by just going away like that!
That guy was shocked and stood there in silence not knowing what to do.
SIL: If you keep standing there, you are doing yourself a great disfavour!
No matter what that guy did, the sister in law will not be appeased! Whether to take advantage, to leave or just stay put in that awkward situation elicits contradictory rebukes!
Moral: Whatever policy will not appease all.