Hulu has made only modest noise with original programming, a situation that could change, and should, with “Difficult People.” Produced by Amy Poehler, this tart, very funny comedy stars Julie Klausner (who created the show) and Billy Eichner as bitchy pals who don’t really have a good word for anybody, except each other. TV has reveled in such self-absorbed characters, but these two are so perfectly loathsome and oblivious to the feelings of others, it’s almost hard not to root for them. Consider it a half-hour that proves bad company, TV-wise, can be good fun.