Everyone is running a complex neural network, that was formed by trial and error, to express complex and often abstract notions for which we may not even share

Everyone is running a complex neural network, that was formed by trial and error, to express complex and often abstract notions for which we may not even share a common context or concept. People think differently, and someone trying to express a concept is essentially walking through the mental model that they made for themselves. It may not work for you for a variety of reasons. Having acquired language via another culture might be enough to make it more difficult or frustrating to understand someone from a different background, even if you both now share the same language.