And how are people who are not among "the bizarre group of old folkies who know each other" to be expected to know that?

This is a public Internet discussion forum. The rules of netiquette apply here. We have the rules of etiquette for JUST THIS VERY REASON.

But if some of you wish to continue insisting there is nothing wrong with starting threads for the sole purpose of arrogantly insulting other posters' bad grammar and spelling, because it is "just a joke" or is done "among friends" I'm sure you will continue to do it.

Some people will always insist on sticking to the low road.