choosid > If your rebbe says one way, Gadol says another….then mistama’ you should listen to a random person
I am not sure why people are asking oorim vetumim, or maybe answering. I am surprised why the adults did not explain the rational for their advice. If they did, he could have something to think about. So, he can at least get ideas to explore here, or go back to his parents/teachers and ask for more details.
PS Usual reason not to give reasons is to make the person follow the rule without an ability to apply his biases and get away from the ruling.