Good point! I used to be guilty of this myself, so now I'm pretty sensitive about other people doing it. I am now one of the more senior students in an academic research group, and some of the younger members would benefit from this advice. I think it's a symptom of sophomorism, and hopefully most will grow out of it.

I agree it's especially frustrating when they don't even get it right. That crosses the line for me, and I will admonish them to let me finish what I am saying.