Why are people so nosey?

For example, I bought a large plant off a Facebook marketplace seller and I had to open the boot of my car… he then stares at the things that are in my car and starts asking questions and acting weird. I had a pair of heels on show and some normal clothes… not lingerie… but he got embarrassed by the sight of red heels… I think it’s none of his business and he shouldn’t be being nosey about what I have in my car… seems quite often that people do this sort of thing.

Why are people so nosey?
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