Is Language the largest barrier to people understanding one another?

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I was reading a book a while back and noticed something later that I failed to notice beofre. I reminded of this later when I was watching Robocop 3 on cable one day. It was the scene when the COO of the company OCP was speaking with another executive of a japanese company. And the conversation was odd to me to hear but easy for me to follow. For those who haven't seen the movie, it was a scene when these two individuals were holding a conversation, but each man was using his native language. The American was speaking english and the Japanese executive was speaking Japanese. And they made statements and respondd back and forth naturaly without a hitch, working on the grounds that each understood the other's language but used their own language out of comfort. Relative to this situation, in the book I refered to prior, an American reporter was trying to interview a Vietnamese fisherman but he wasn't getting far. And the Vietnamese fisherman was very reluctant to answer after a while for lack of comfort. But the American reporter studied French abroad and made a French reference. The Vietnamese fisherman suprisingly began speaking French fluetnly and they had a very deep conversation. And although his english was ad, his French was quite eloquent and revealed that the fisherman was increadibly educated and well spoken. And from my perspective as the reader, I was quite suprised as well. it made me relfect on m experiences I had at a few jobs out here as well. I have worked with many Hispanic coworkers before and the alot of the misunderstandings came from people getting frustrated at the fact that some didn't know much english and others couldn't understand spanish. But I understand more spanish than I can speak, so I didn't even notice when I heard something in spanish and responded in English that they were suprised. But things went much more fluidic and we grew to mutually respect one another more. This wasn't always the case, but in other instances the same thing occured. Sometimes in Russian, Korean, Japanese and Manderin the same cases occured. People became much more comfortable knowing that they could talk to me. And I was comfortable around them as well. Sometimes, though, people use the language barrier against others under the unfortunate premise that Americans can't and won't speak and understand other languages. And then get frustrated when others speak around them in other languages because they don't understand. Therefore, it is my summation that if we as peoples from all walks of life were able to understand others, there would be less confusion and offense. What do you think?