中国之行 (China's trip)

你们好!
我的哥哥中国之行回来了. 他说了中国人们不爱喝绿茶. 这是正义真的吗

Hello to everybody!
My cousin travelled the China. He said that Chinese don't like to drink green tea. Is it right?

     茶也是中国文化之精髓，中国人爱喝茶，而且茶叶的种类非常多，每个人都根据自己的喜好选择茶叶，所以绿茶也会有人喜欢的。

中国之行 (China's trip)

你们好!
我的哥哥到中国来了. 他说中国人不爱喝绿茶. 这是真的吗 （welcome  to  China)

Hello to everybody!
My cousin travelled the China. He said that Chinese don't like to drink green tea. Is it right?

From your English translation

遊玩中国之行 (China's Trip)

你们好!
我的哥婊哥1 到达了中国之来了. 他说了中国人们不爱喜欢喝绿茶. 这是正义真得吗

我的婊哥到达了中国.他說本地人不喜欢喝綠茶.是真得吗?

Chinese on the whole, generally prefer the darker ie more fermented types such as the oolong, iron goddess variety.  Green tea on the other hand is very popular with the Japanese.  Of course in the West, especially California, green tea is more popular because of the perceived health benefits.  Californian culture is obsessed with health and beauty.  Thanks to Hollywood.

1.   In Chinese, you need to specify the exact type of cousin.  Is he/she from the paternal or maternal side?  Is the parent older or younger than your parent?  Then what is his rank in his family.  Chinese rigidly define such relationships for at least 9 generations although in practice, it is limited to 3 generations or so.  You need to learn such relations.  There's a huge difference between 三姑媽 and 三姨媽 etc.

Hello to everybody!
My cousin travelled the China. He said that Chinese don't like to drink green tea. Is it right?

中国之行 (China's trip)

→an authentic title!well done! 

你们好!
我的哥哥中国之来了.

→我的哥哥来中国了。（“之”sometimes means "来"，it is commonly used in ancient chinese）

他说中国人不爱喝绿茶。（“中国人”is  a collective noun,so you don't need to ad a "们"）

这是正确的吗？（“正义”means justice,“正确”means right/correct）

PS:1）中国人喜欢喝茶，不仅（not only）是绿茶，还有其他茶，例如“普洱茶”、“功夫茶”。

2）as for "绿茶"，if a girl want to lose weight,she would like to to drink "绿茶"。

不同的人有不同的偏好（preference）。

中国之行 (China's trip)

你们好!
我的（表）哥(从）中国（旅行）（回）来了. 他说了中国人们不爱喝绿茶. 这是（真的）吗

Hello to everybody!
My cousin travelled the China. He said that Chinese don't like to drink green tea. Is it right?