I recently witnessed this and it made me curious about the question in the title. The story:
A student in our department recently presented an idea for potential research to our full faculty at the request of her advisor. It was clear the idea was preliminary and I think she was pressured into this under the auspices of receiving feedback as early as possible. However, the faculty proceeded to shred this student. Bombarded with questions - it became almost blatantly rude and was consistently over aggressive. As one of the department's newest members, I feel uncomfortable to really say anything to anyone but this seemed completely unproductive. Also, I imagine that this student (and other students in the room) will now sit on ideas for way too long because they will think an idea should be perfect before asking for advice, which is obviously contradictory (right?).
So, do others think this is a bad approach? Does something similar happen at your department? This is definitely not something I experienced as a student.