Don’t give your opinion on anything, especially this.
Remember that it is essential to share your questions, thoughts, and views, but try to avoid putting other people on the spot. This is because some people need to be the first to speak out in every situation, even though it is important to share these things.
It is incomprehensible why a student who is several decades younger than her female teacher would consider this behavior appropriate; however, I believe it is reasonable to conclude that this guy’s interest in the topic at hand and his desire to mansplain made the instructor and possibly some of the other students uncomfortable.