Hillary Clinton's presidential run has sparked a lot of discussion about feminism, with many younger women defecting to Bernie Sanders and older ones accusing their younger counterparts of betraying the cause — all of this accompanied by oft-anguished attempts to define just what feminism is. The Nest, Theresa Rebeck's play about the fate of a fabled bar, was written a year ago — it began life at the New Play Summit — but it's very timely. It begins with a man and woman arguing (actually, he's mansplaining) until the temperature rises and the woman tosses her basket of fries at the man's face. As soon as the couple leaves, bar regulars start bickering about who won the quarrel, and it's clear the men see it entirely differently than do the women. The Nest is a terrific conversation-starter, passionate but not didactic, very clever, and as funny as it is thought-provoking.