There's no such things as experience or professionalism?
That's great. I'll be off to set up my own studio now. Incompetence? There's no such thing :-)
Seriously, trained/golden ears is a huge bit of BS that gets tossed around here, all the time.
The only thing you can "train" your ears to hear are artifacts from lossy encoding, but even then, it isn't "training" so much as listening closely.