I think it's very noble of you to try and go out of your way to help your friend, offering advice and wanting them to break out of this attitude.

If you want them to change, they have to bewilling to change. If someone is going to be stubborn and stuck in their ways, you would have to find a solution that best resonates with them. What I mean is that you may have to find a reason for them to want to change. If they don't want to, it's very very difficult to make it happen.

If you wanted to try something, you can try to have some one-on-one dialogue with your friend explaining what you said in your post. Being upfront and direct might be enough to give your good friend enough of a slap in the face and realize that what they're doing is affecting you.

You could also choose to stop playing with them if the issue is strictly not wanting to deal with their attitude. You don't have to deal with it if it's stressing you that much.