I'm not sure what I was going to say about it, but diplomacy sure is a good topic.
I don't mean the professional diplomacy performed by ambassadors, foreign ministers and heads of state. It's the daily stuff that passes between ordinary individuals that really matters. We could do with a lot more of it.
Oh, before we go any further, let's call it what it really is... Courtesy. Some businesses call it customer service.
It is simple enough to accomplish. Just acknowledge others and give the same attention that we desire. Say to ourselves, "It's not about me."
If that doesn't work, wait a day or two and you'll forget whatever snarky remark you were going to make. That is accidental diplomacy. It's just as effective even though it is unintentional because nobody else knows.
Isn't it a lot better when others don't know than it is for them to misunderstand?