Yes. Running sound for a concert in THE shittiest sounding room (concrete cube). I warned them how bad the sound is and I'll do everything I can but in the end the room is awful and there is no way around it, we will do the best we can without getting screaming feedback.

Singer of this band was a real cock. Literally said (not jokingly) "I'm famous you know". Wanted a monitor pointed directly at him blasting obscenely loud (louder than the mains) while he played acoustic guitar and did vocals. If any of you have dealt with a stage monitor pointing directly into a guitar sound hole, you know how bad this is. And he wanted it louder.

Walked right past me at the end of the show , totally ignored me. At least the rest of the band was decent. But that guy was really full of himself.

I'm not a pro mixer. But ive heard pros in that space and it sounded just as horrible. You can't fix a bad room with tech.