I like to come here and read and had to create an account because this is one I can answer!
I lived in an apartment in OK. I was in a similar situation. The short of it is they are responsible for damage that isn't your fault. As long as you live there.
So if the sink broke because of the weong washer the apartment management is responsible for fixing it. You're just obligated to inform them. What happens after that is their responsibility. If they don't come and fix it and it gets worse it's legally their fault.
Now what I can't answer is about the guy who cussed at you. I don't know if you're responsible for not telling them. On one hand maintenance clearly knew there was an issue. But odds are the guy didnt tell anyone else and he no longer works there you said. So legally it may not be the same as telling them. You just more assumed they knew thinking mo one could forget an interaction like that.

