According to this article, being open to understand the culture of a place that speaks the language that we are studying can greatly help us in our second language acquisition. I think this pertains more to the immersion phase. Aside from perhaps equating their culture to the etimology of their language etc., by knowing, understanding and respecting their culture, we can really gain native friends, who can graciously help us with our learning.
https://www.strategiesinlanguagelearning.com/language-learning-and-culture/