My brother is a driving instructor. He teaches strictly, does not coddle, requires his pupils to give their best. A lot of dissatisfied, he is constantly complaining to his superiors all sorts of offended. And one madam in general voluntarily asked to him, saying that he is the best instructor in the city, just like that no one else did not want, only with him. Although he yelled at her famously, but she apparently did not care, she only smiled in response. And then, when he once again yelled at her, took and filed a complaint. Is that even normal?
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Sounds like your brother values discipline and hard work in his teaching approach. However, it's important to remember that effective communication and respect are key in any teaching relationship. Maybe he could benefit from finding a balance between being strict and being understanding to avoid such situations in the future. 