For the first one here, the writer seems to be describing how parents might instruct their children if another adult wants to be on a first name basis with them. However, imagine the several ways that the request might be phrased, and how that can affect the description of it: >"Please, call me by my first name." ... "He asked that we use his first name." >"Call me by my first name." ... "He told us to call him by ..." >"You may call me by my first name." ... "He said we could call him by ... ." >"You should call me by my first name." ... "He said we should call him by ..." >"You must call me by my first name." ... "He insisted we call him by ..." In the given paragraph, the writer is making a generalized statement to cover all situations. He could have easily said "should be used" or "may be used" -- the overall meaning of the sentence would not be greatly affected, and the writer's point would not be lost. However, there ARE subtle differences when certain wording is chosen. Secondly, "stick to your guns" is a figure OF speech, as described in previous answers. It's true, you may never see the adaptations "etiquette guns" and "gun-sticker" again, but it demonstrates the how versatile the idiom is. It's quite common to see it in ordinary, day-to-day situations. Note that you may also see a British variation -- "Stand to your guns". Finally, the writer being "on a lonely road" just means that there aren't (in his opinion) many people like him, who continue to observe traditional, old-fashioned standards of formal social conduct.

"...that their first name be used..." = "that their first name should be used"? More or less yes, but to me the second phrase is rather weak. I wouldn't use them so interchangeably. When you "stick to your guns", it means standing by what you think or have said, in spite of any opposition. The image is of a soldier in a battle, who chooses to stick to (stay with) his guns and fire back in spite of the bullets flying around him. The term "gun-sticker" is a turn of phrase base on the original idiom. It's hardly common, but we recognise and understand it. In this example, the writer talks about people who stand by standards of etiquette. "On a lonely road" means the person is alone in their beliefs. They are "travelling on a lonely road" (ie. without company or support).

Yes to your first question. "Stick to your guns" is a figure of speech that means standing by your beliefs, and not changing your mind because of others. "Gun-Stickers on a lonely road" means staying true to your beliefs even if you are the only one. I hope this clarified for you ;)

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