When I'm away from my home dojo training with someone I've never met before who doesn't speak the same languages as I, can't gauge his power, time my attacks, bend his knees or utilize distance, that affects my training.
When a person with a slight but obvious mental handicap responds to my horisontal bo swing with a useless parry and a hard, non-scripted thrust to my ribcage with a bokken, that affects my training.
When a dan-ranked person in Honbu asks me to take one more step with my attack to "make it easier for both of us", that affects my training.
When we're doing takedown randori from a kumiuchi hold, and a green belt attempts to pull off an oni kudaki on me which would have resulted in a torn rotator cuff on anyone with less training time under his belt, that affects my training.
When I let go of an armbar after having brought a person to the ground, and he immediately attempts to kick me or go for a singleleg just to prove that he can, that affects my training.
When I encounter someone who can't feel the difference between strength and power, that affects my training.
When a 15th dan drops his sword from his belt during a demonstration and tells everyone present that it doesn't matter, that affects my training.
When a person for some reason refuses to do what the instructor has just been showing because "it's about a feeling rather than a technique", that affects my training.
When I've got my knee over someone's elbow and he attempts to muscle out of it, because he believes that pain indicates the usage of strength, that affects my training.
When a person punches or kicks where I'm headed instead of where I'm at, that affects my training.
When fifth kyu who receives fourth dan in less than two years not only points a soft air gun at a 15th dan and pulls the trigger, but remains constantly hunched over as if he's constipated and actively works against the things I'm attempting to replicate from the instructor in charge, that affects my training.
When the instructor tells everyone that it's time to drop the swords and go over the footwork again because everyone's doing pure, unmitigated crap, that affects my training.
When someone attempts to counter my movements out of sync because "it's more fun for me that way", that affects my training.
When someone punches at me with a half-open fist, that affects my training.
When someone can't pull his knee up to his chest and do a proper kick, that affects my training.
Etc etc etc.
Now, if I myself were a judan+ with the stomach for putting up with the constant smell of chlorine and used cooking oil whilst living in Japan under constant exposure to the best the Bujinkan has to offer, then I too could care less about the skill level of other people, especially in other countries. That is however not the case. Make of this what you will.