What you experienced is an example of a very disillusioned individual using a random person as an audience. “You can’t possibly know the trouble I’ve seen”.

While it felt like a personal attack, it wasn’t about you personally but all about his own disillusionment. It can be very unsettling to experience that. It’s more about how that person is lost in his own head and not about you. You just got to listen to a conversation someone was having with themself out loud.