Tourist, bullying is for the enemy; its not for your own damn side.
Firm instruction is fine. Even shouting, when required, to elicit life saving action is essential some times, and no one is saying that you need to be fluffy and hugging all the time but being threatening and making people scared to learn, just in case they make a mistake is a disgrace.
Some people will need to be chopped, some will learn at a slower rate than others but can make the grade, some learn slow and then have a ureka moment and become excellent but its the job of the instructor to work that out and help not hinder progress.
Now, I'm not an aviator, but I have experienced good and bad instructors in my fishead world, along with good and bad bosses. But the ones that bullied their own team were the ones that sometimes succeeded in achieving very short term aims, but invariable failed to achieve long term term professional performance from those around them, even when they were technically capable. They were the ones at fault.