I think he's trying to mitigate any potential chance for failure. There are clearly issues with some training departments (EGL, and PDT are two I can think of) and you would do well to steer clear of the known problem children, but really OP -- if you want to do well in your training, apply yourself. Study hard, and I doubt you'll fail unless you can't fly or memorize profiles or multi-task or you tend to choke on oral or sim evals.

Almost every training department has their "special" person who likes to make it hard on newhires -- that's just the way it is and you had better be prepared if you get that person. Also, no one's immune to having a bad day. You just prepare the best you know how and get on with it.