Yup.
Explained the oryx mechanics 5 times over. This one guy NEVER went to detonate his bomb. I explained to him over and OVER to step in the bomb. But every time I called to run for his bomb. There he was stuck in the middle. Not moving. So I ran to get it for him and got killed trying.
I was literally yelling at him, he caused three wipes by this point. Telling him he needed to detonate the orb and asking what the issue was. He just responded 'what am I supposed to do? Shoot it?' After I had explained it 6 times at that point. I gladly Sherpa people through the raid all the time. But some people are just beyond help. I just told him I couldn't help him. Booted him. Brought in someone else who also had never done the raid. Explained the mechanics to him once and we did it first try.
I have gotten people through hard mode, doing challenge mode. Even when they have never actually killed oryx before. But if you don't even make an effort to listen, I won't help. I can't help.