>>212159510
>>212161096
Picrel is the only other case I could find where オレンジ側の人間 is used.
But apparently it refers to the color of the jacket worn by members of the same group participating in an activity or something involving multiple teams.

>>212161096
へー、この回のテーマが風水だったのかな?
前提知識がないと「オレンジ側」と言われても思い浮かぶものがないね。