the life preserver to be tossed is: “I don’t think you realize how that sounds. I can’t imagine that you really believe that, but in any case, let’s … - Judith Martin

DEAR MISS MANNERS:
When does a gentleman offer his arm to a lady as they are walking down the street together?

GENTLE READER:
Strictly speaking, only when he can be practical assisstance to her. That is, when the way is steep, dark, crowded, or puddle-y. However, it is rather a cozy juxtapostion, less comprising than walking hand in hand, and rather enjoyable for people who are fond of each other, so Miss Manners allows some leeway in interpreting what is of practical assisstance. One wouldn't want a lady to feel unloved walking down the street, any more than one would want her to fall of the curb.

But sometimes one hears an Etiquette-Buster’s confession that rings true: “You make me feel guilty.” I’m not going to bother, this argument goes, so we need to lower the standard so I don’t look bad.

Nobody believes that the man who says, 'Look, lady, you wanted equality,' to explain why he won't give up his seat to a pregnant woman carrying three grocery bags, a briefcase, and a toddler is seized with the symbolism of idealism.