I have an old coworker in a group of friends that fits this description. Its frustrating because they will continue to spout this stuff off confidently, but not

I have an old coworker in a group of friends that fits this description. Its frustrating because they will continue to spout this stuff off confidently, but not ever listen to the counter argument or understand that their philosophy is flawed. It makes it challenging to continue to engage with this group of friends.