In some families, when male guests are over, its not favorable for (older) daughters and wives to mingle with them in the same area, so they go to their rooms or other parts of the house.
Sure the husbands of women who do purdah can have guests over, but the guest, especially when he knows if the family has that value, should be considerate when he knows hte wife is uncomfortable being around na-mehram men and not stay too long; its the husbands responsibility to make other arrangements to meet his friend where it wouldn’t make his wife uncomfortable in her own home.