To go further with the wing-mirrors analogy ...
Isn't the trick to choose your wing-mirrors carefully?
Choose the wrong wing-mirrors and it can be "collusion", ie, people as barking as you are, perhaps, prone to be, confirming that shouting at people on the bus because they haven't trodden on the person with a walking-stick in front of them, in their haste to make room for you to alight is a good thing, or that purple ball-gowns + red cardi + platform boots is the norm for the school-run, etc.
or it can be destructive, ie. your inner voice will never agree with their opinions and you are always left feeling "wrong".
When you're young, or are going through a period in life where you are feeling a bit at sea about your identity and confidence, you run your opinions, and thus a bit of your identity, through other people. That way you check out who you are, and at the same time, what sort of things/people you like or don't like, agree with/don't agree with.
As you get older/more confident, that process is streamlined; you can dismiss a lot of stuff/opinions right from the off (eg. "No, this person eats other people. If they don't like the food I've cooked tonight, it may be their problem" or "This person is wearing pyjamas and a tea-cosy. She doesn't like my choice in boots. I don't think PJs + woollen headwear initially designed for tea-pots is a "look" I want myself (having tried it myself, once, when younger. Therefore I may decide to discount her opnion.").
So your "wing-mirrors" get easier to choose. Maybe.