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.
"Just give me two seconds, alright, you mad bastard!" - Montgomery Scott, Star Trek Into Darkness