I think truck nuts are a symbol of a certain lifestyle and perspective in life.

They symbolize something specific. A fixation on displays of masculine superiority (even on shoes).

A symbol of insecurity and extreme gender conformity and promotion of toxic masculinity in its most basic form.

Having male genitals on display to prove your manliness.

I don't have a problem with artistic expression in style. But the message being expressed here is not a testament to the progress of humans but the opposite.