I'm always upset when I see captains telling me not to do things the way that I was trained to do by a training captain.'
If you a not a company approved training (and check) captain, then shut your
mouth and don't pretend to be one when you are not.
If you got any serious safety issues (not small issues which don't matter at all), then take it up with the training department and don't confuse us FO's by telling us to do something different to the way we were trained.
Then again, I am sure there are some FO's who like to do their own different thing. However a quick discussion with the training dep't should enable you to work out if the problem is with the FO not complying or his training.