This guy sounds like a text book narcissist. The worst thing you can do is tell a narcissist they are a narcissist. It will do nothing and will only make them double down. The best thing you can do is cut them out of your life.

I had a similar situation when I was in my 20s. Friend I had that I’ve known since highschool would always make remarks about how I got so lucky with my job. Because I was making decent money (more than him) without a degree and he was an engineer. It didn’t matter that I worked my ass off and put in thousands of hours, I was lucky.

If I would ever push back or say something he would just double down. I couldn’t bring up the fact that I didn’t have parents that paid for everything while I was in school, so I had to work and go to college at the same time. I finally realized that was just the way he was going to be, so I limited contact with him. However, his comments never went as far as what you are describing. So, I think you’re doing the right thing by just blocking him.

I highly recommend reading the book Emotional Vampires. It teaches you about the different personality types you’ll run into in the working world and how to deal with each type (when you can’t just avoid them). I wish I had read it 20 years ago.