Answer:
I guess note...............
You didn’t attach the poem, but I would assume that it is because the boot is used more frequently, and there’s a familiarity between the boot and a person that isn’t always present with the dress shoe– one is likely to be owned by many.
This is a metaphor.
Similies use "as" or "like" to explicitly denote a comparison and personifications give human-like characteristics to animals, objects, or concepts.
Hope this helps! :)