the vast majority of people constantly seek more power. More power over worlds, countries, towns, work environments, family, friends, social circle, their trailer park, trailer, significant other ... it's the flip side of the curiosity drive we talking apes have.
And one of the easiest ways to assert power is to try and get someone to do something the way you would, or want them to, regardless of context or suitability. This is where the unwanted advice comes in.
It's part of the rich tapestry of lie; unfortunately, most of the threads of that tapestry are made of pure bullshit.
I suggest developing some rapier-esque foils so you are prepared for the next unwanted advice sessions.
I always find 'I think you must be confusing me with someone who gives a good fuck what you think' works very effectively.