I'm growing (or perhaps just realizing that I always have been) disenchanted with the quality of boys' training. I feel that in mixed-gender classes, they do not receive the same quality of instruction the girls do, and I don't think there's any reason for this. Contributing to the problem, in my opinion, is the lax standard in terms of attire. Letting the boys wear soccer shorts is fine when they're 8, but even when they are 10 and in proper attire, they wear saggy tights and oversized shirts. Imagine if the girls came to class in leotards three sizes too big with the crotch of their tights somewhere around their knees--it would never be allowed, and for good reason: properly fitted ballet attire allows the instructor to see the muscles better so they can offer corrections.
What this boils down to is boys who do not develop the same work ethic girls do in terms of perfecting their technique, unless they are already very observant and self-motivated from a young age. By the time a boy is a teenager and has developed his own motivation, the foundation that good early training would have given him is not there.
How to fix the situation? It's simple: Hold boys to the same standards as the girls!