Many law students are the worst kind of people, particularly during your first year. They all try to sound smart in class. It seems like EVERYONE understands everything. But it's an act. You see, many of these people raise their hand every time they know what's going on. So, if only 2-3 people are raising their hand, that lets you know a number of people don't know what's going on.
The smartest people are often the people not saying anything.
That said, I don't have an issue with people speaking up in class. I just have an issue when people do it to try and sound smart and intimidate their classmates. (I haven't really seen this after first year).