Maybe there is not theory which tells us about it, but it's a reality that I noted last weekend when I was working and an asian girl attended to my work to buy something to eat. She told me something in japanesse maybe (I don't know) and as she noted that I haven't undertood anything, she told me something like "yo quiere eso", and what I answered was "eso ¿qué?", so she pointed out to me something in the board and then I understood what she wanted to say and I felt bad, because maybe she also felt bad trying to comunicate without can do it and I couldn't help her too much.

With this, I noted that the comunication is hard for foreing people who come from another place without to know the language. However, there are a lot of people that help them with it, but in the other hand, there are people that don't help them and make a lot of laugh about their comunication's problem.
Finally, I think it's something that we can change easily. So, start thinking about other thinkings, and don't make reviews without knowledge...
Here there's a clear example of it, watch it, you are going to laugh a lot (I hope)
I hope you like it, please comment and make me happy :)
Make different things to see changes, don't stay where you are because things are going to be the same.