Oh fercrhissake. Yes, yes, of course if you have a completely incompetent instructor or there is some extenuating circumstance, perhaps, but let's not get carried away with being PC here.
Absolutely nothing to do with being PC. And unfortunately there are quite a lot of incompetent instructors, or ones who are unsuited to instructing anyway. There are even more who have personality clashes with their students. And how come I know quite a few people who got stuck, changed schools or instructors, and hey presto, they got through the problem? And how come I know THREE instructors who were at one point told they would never make it to PPL level, let alone further?
Not everyone can drive a car, fewer can drive a fixed-wing aircraft and fewer still can drive a helicopter. That's life.
Really? I've so far not met anyone who can't fly a helicopter. I've met some people who think they can't. I've met some who learn far slower than they'd hoped. I've met some who require great patience on the part of their instructor. But I suspect almost any fool can fly a helicopter, given enough time and a patient instructor. We rotary pilots like to keep up the myth that it's difficult, but to be honest, that's a load of codswallop.
OTOH, I've met some people who shouldn't be allowed near a car, aeroplane, or helicopter, or even a kiddy pedal car, whether they can drive them or not. But that's a different story.