Gallantry (noun): brave and noble; polite to women.
Source: Webster’s New World 4th Edition (pocket dictionary).
Susan Glaspell says the following “‘And yet,’ said he, with the gallantry of a young politician.” But before this, she mentions that the county’s attorney seemed to have remembered his manners. This helps to understand the meaning of gallantry even better. “Remembering his manners” implies that gallantry has to do with being polite. Honestly, I feel like it was used sarcastically because of how the men were treating the housewives.
Diana Galvez