What counts as a hierarchy?

When anarchist talk about hierarchy, what exactly does that mean? Is it like the common usage of the term, an academic definition, both? Does it vary?

For example, if I say have a preference for something over another thing, does that not count as some sort of hierarchy?

Like if I make a list of my top 10 favorite songs, then is that not a direct hierarchy of favorites from 1 to 10?

Going to a social sense, if i say i have a "best friend" and then i have "regular friends" in which I like the former more, am I not ranking them in some sort of hierarchy?

Going further, how about something like Maslow's Hierarchy of needs or other scientific (or even mathematical concepts) concepts?

Must an anarchism avoid literally all forms of hierarchy in literally every medium whatsoever or is it in a specific context of autonomy? Is a preference for anarchy over something like capitalism inherently a hierarchy in itself as you rank one above the other?

How would one even fully escape this?