As a new instructor I've had the priveledge of sitting in on some classes. One commonality I've noticed is that if students feel comfortable in the program, they make comments. Sometimes it's just for fun, sometimes its just to complain and other times it seems like it just popped into their head and they spit it out. I imagine many of these comments have validity or offer doorways to student perspectives. Addressing some of these comments in private or in front of the class seems a way to build rapport and show that you are listening and engaged with students.