YOU SAID:

my parents would say that the Japanese always sound angry and I'm thinking it's because they talk fast so to them they sound like they are having an argument when they're just talking

INTO JAPANESE

私の両親は、日本人はいつも怒っているように聞こえると言うのですが、それは彼らが早口で話すからで、ただ話しているだけなのに口論しているように聞こえるのだと思います。

BACK INTO ENGLISH

My parents say that Japanese people always sound angry, but I think it's because they speak so fast that it sounds like they're arguing even when they're just talking.

INTO JAPANESE

両親は日本人はいつも怒っているように聞こえると言いますが、それは彼らがとても速く話すので、ただ話しているだけでも口論しているように聞こえるからだと思います。

BACK INTO ENGLISH

My parents say that Japanese people always sound angry, but I think that's because they speak so fast that even when they're just talking, it sounds like they're arguing.

INTO JAPANESE

両親は日本人はいつも怒っているように聞こえると言いますが、それは彼らがとても速く話すので、ただ話しているだけでも口論しているように聞こえるからだと思います。

BACK INTO ENGLISH

My parents say that Japanese people always sound angry, but I think that's because they speak so fast that even when they're just talking, it sounds like they're arguing.