"The thing is, different languages have different inherent characteristics (syntax, features) and different cultures (pertaining to libs, common practices, frameworks, etc), so one can tend to create more spaghetti code than the other, the programmer being equal."

That's simply not true. If you are organized, you will use whatever structures the language you are using provides to you (classes, modules, namespaces, etc.) to NOT write spaguetti code.

Spaguetti code it's not inherent to the language, it's inherent to the programmer.