What is the author's style in I'm Not Rappaport by Herb Gardner?

Essentially, the play is a series of conversations between two old men on a park bench, with some dialogue between the two men and other, secondary, characters thrown in. However, if this simple explanation were all the play had to offer, it would not be as popular as it is. The play is noted for the interplay between Nat and Midge, whose cantankerous dialogue is engaging. The play starts out with Midge antagonizing Nat and saying he will not listen to him anymore. When Nat asks Midge why, Midge says, "Because you're a . . . liar. I'm not listening to you anymore. Two days now I ain't been listening." By this comment, Midge reveals that, as much as he does not like to admit it, he has been listening to Nat; otherwise, Midge would not know that Nat has been making up stories. Therein lies the formula that Gardner uses for the rest of the play. Nat does most of the talking and aggravates Midge enough to produce some spirited retorts but not enough to make Midge want to leave.