The Ladies' Book of Etiquette, and Manual of Politeness

In conversing with foreigners, if they speak slightingly of the manners of your country, do not retort rudely, or resentfully. If their views are wrong, converse upon the subject, giving them frankly your views, but never retaliate by telling them that some custom of their own country is worse. A gentleman or lady of true refinement will always give your words candid consideration, and admit that an American may possibly know the customs of her country better than they do, and if your opponent is not well-bred, your rudeness will not improve his manners. Let the conversation upon national subjects be candid, and at the same time courteous, and leave him to think that the ladies in America are well-bred, however much he may dislike some little national peculiarity. Avoid, at all times, mentioning subjects or incidents that can in any way disgust your hearers. Many persons will enter into the details of sicknesses which should be mentioned only when absolutely necessary, or describe the most revolting scenes before a room full of people, or even at table. Others speak of vermin, noxious plants, or instances of uncleanliness. All such conversation or allusion is excessively ill-bred. It is not only annoying, but absolutely sickening to some, and a truly lady-like person will avoid all such topics. I cannot too severely censure the habit of using sentences which admit of a double meaning. It is not only ill-bred, but indelicate, and no person of true refinement will ever do it. If you are so unfortunate as to converse with one who uses such phrases, never by word, look, or sign show that you understand any meaning beyond the plain, outspoken language.