I am too, this can be really helpful to you I think.
That "high up on the narcissist scale" guy I dated (ugh). I also got to really see how he was - it was all bad.
It would have been nice to be able to do it over a cup of coffee instead!!
If you look at what he said, everyone else is completely wrong, wrong, wrong. They do everything wrong they say everything wrong they live their lives wrong. He, is doing the best he can! Right. But that's ok, that is his life.
Now you, you are doing just fine. There is nothing wrong with having compassion for someone, I think you handled that whole encounter really well.