Well, certainly there are "some Americans who despise Chinese people" but not BECAUSE they speak poor English. They rather USE this as a means to degrade and mock Chinese people. Obviously Chinese and Americans have different cultures, which in some cases lead to hatred. It's merely because lots of people around the world, and not just Americans, don't know our history, don't understand where we Chinese come from and why we behave like we do. The whole world is screaming at us, trying to make us adapt to the western pattern. Well, we respect your customs, wish you could respect ours!

Actually, 左拐 is a shortening of 往左拐. This may help you to understand why we say 左拐, not 拐左.

They are basically the same. There's only a small difference in apprehension. 听他们说... You have (accidently) heard them say. You might not know who "they" are. 他们说... You have heard them say (and you know who "they" are)

呵呵，谢谢你们。 那么，我姓白，想用春。用这两个有什么好听的名字呢？

Explaining using simple sentences would be to prefer.

"They say it will rain tomorrow" 他们说明天要下雨 "One says/People say it will rain tomorrow" 有人说明天要下雨 "I would say it will rain tomorrow" is totally different from the above, only because of the "would". This meaning of this sentence is really "I think/guess it will rain tomorrotranslate it is translated as 我觉得明天会下雨.