“Dear White People” is the name of Justin Simien’s first feature film, and I’ll say right away that it is as smart and fearless a debut as I have seen from an American filmmaker in quite some time: knowing but not snarky, self-aware but not solipsistic, open to influence and confident in its own originality. It’s a clever campus comedy that juggles a handful of hot potatoes — race, sex, privilege, power — with elegant agility and only an occasional fumble. You want to see this movie, and you will want to talk about it afterward, even if the conversation feels a little awkward. If it doesn’t, you’re doing it wrong. There is great enjoyment to be found here, and very little comfort. — A. O. Scott