Situation 1) A mum / a friend / a person you saw in the street is doing things in a way that you wouldn't. Their actions have no bearing on your life.
Ignore it and move on with your life, don't waste precious hours worrying about it.
Situation 2) Your normally reasonable other half has been doing something you don't like.
Decide if you can live with it, and if you can't, talk to him politely and like an adult, and work with them to resolve it.
Honestly, so many threads here would be so much easier if people weren't getting so worked up over the trivial annoyances that make up part of life. Not being so bloody nosy would also help 