さらにバカ全開 GovernorWatts (2 hours ago) noname4moa, I'm not surprised. As you said, you're Japanese. Just as some older white Americans may think "nip" or "Jap" is an appropriate way to describe you, some Japanese don't have a problem referring to immigrants as "outside people."
The word is "gaikokujin," not "gaijin." Check your own Japanese wikipedia entry under "racism" and you'll find a reference to the word gaijin.