What distinguishes creoles from non-creoles?

....?

Not much. See "Middle English Creole Hypothesis"

It's a way for us Europeans to feel superior and to reduce their mode of speech as secondary.

>>It's a way for us Europeans to feel superior and to reduce their mode of speech as secondary.<<

Ironic, when many European languages are much simpler than a lot of non-European languages.

You are simple.