I hope my kids don’t feel offended when I point out good etiquette to them. I think they probably know it all by now, but sometimes I’ll point it out just to remind them, and sometimes I’ll point it out/affirm their actions a little louder than usual so that others in the vicinity can get the hint — for instance on the escalators at stations: “That’s it boys, stand on the left.”
Little Lonsdale Street has busy but narrow footpaths. Something I’ve noticed is that some people haven’t figured out that when walking with someone else, it’s rude to take up the whole footpath when you encounter a person coming the other way.
Generally when faced with this, I’ll just stop dead on the left hand side of the path, rather than acquiesce and step aside onto the road. (Well why should I?) They usually take a hint then and grudgingly fall into single file.
(Not as bad: walking slowly 2+ abreast, filling up a footpath, oblivious of others in a hurry trying to overtake you. Still inconsiderate though.)