(Strip Number 4624, Original Publication Date, 2 June 1986)
Panel 1: Elly tells John that she is angry about the city tearing down the Old Town Hall and refuses to let that happen.
Panel 2: She then goes on to say that she's going to protest, write letters and so forth because she wants to preserve their heritage.
Panel 3: Having just entered the room and noticing that Elly's babbling like an angry lunatic about something that isn't him, Michael asks John what's wrong.
Panel 4: Since John is an asshole who thinks that everything Elly does is because her scary and weird woman hormones make her care about things she shouldn't care about, he tells Mike that she's joined the Hysterical Society.
Summary: Five bucks says that the root cause of all of this is Rod trying to point out that the world doesn't work the way Lynn thinks it does. Failing that, he must have angered her by telling her that Elly looks like the housewife screaming about how a needed development will somehow threaten her children.