"They could start an argument in an empty house."
Was just watching this video, https://youtu.be/mHHXxA3FYt4, and at the start she said
"It normally takes two people to have an argument"
It reminded me of a (Scottish?) expression I once heard:
"They could start an argument in an empty house."
And I just remembered how often I used to think that during the relationship.
Another phrase I've used a lot over the years to describe a narcissist in my life is:
"If they won the lottery jackpot, they'd ring up and complain that the cheque was the wrong colour."
Another video I saw recently said that when trying to describe a narcissist to someone in authority (like a child protective services, a judge or the police), you shouldn't use the word "narcissist" as it will actually count against you; because you, a non-psychiatrist, 'diagnosed' someone else, so you are the labelled as the inappropriate one.
But the helpful advice in that video was to use the word "antagonistic" instead; it's not a diagnosis, so you can't be criticised for using it, but people will work out what you mean very quickly.