I like to be confrontational.
In your last example, about the Olympians being too white, I’d ask them what’s wrong with more variety?
Sometimes these people just want to attack Biden because he’s Biden.
In your first example, about other people messing up the washers, I’d say
“Or maybe it’s because the landlord refuses to fix anything.”
In reference to people trying to sneak into the pool, I’d just ask “what’s wrong with them using the pool?”
I wrote an article on how to debate people who refuse to wear face masks a while ago. The principles behind it apply here if you want to check it out.