Not your fault at all. These are just the kind of people that want to do martial arts for the reputation and want to learn it without sweat & blood. Kind of an alibi thing.
Encountered plenty of them during my martial arts career and even had female black belts running out on me crying like little girls, not because I overdid it on them but because they could not land any hits on me. These black belts became trainers later on themselves...makes you wonder.
I personally really hate training with kids/teenagers as the mix up is just a disadvantage for either one of them, either for the adult as he doesn't get anything out of sparring with a teen or child or for the child or teen as they feel overwhelmed by the often stronger and more experienced adult.
I am currently doing Shotokan Karate and we have tons of people who want to practice martial arts without the martial arts.....Unfortunately our dojo doesn't even have a punching bag hanging up or anything solid you can punch. If we are lucky our sensei gets some punching pads out from time to time we can hit in a controlled manner (lame).
You don't know that it's not his fault.
You seem quite anti female here, I'm not sure why you are training somewhere you are quite contemptuous about.