Re: most "wrong" episode...
To me there are a few TOS episodes. Omega Glory comes to mind. The savage "Yangs" (who are white) that love freedom and the "Kohms" (of Asian descent) are oppressed.
I'm not sure that was the intent, more about giving the audience something they easily recognize.
The Confederate flag is the flag of a terrorist state that took up arms against the United States of America. - SeerSGB (fellow TrekBBS member)