I despise McCoy for example, I understand he's supposed to be the emotional one of the main trio but being emotional doesn't mean you have to act like a racist hick.
One, he's nothing of the sort.
relentlessly insulted the human race throughout all three seasons of TOS in manner most would see as racist. However, because Spock is the "outsider" amongst humans, some observers develop politically selective glasses through which the series is analyzed.
I also don't think Star Trek was as smart as some fans (and apparently Roddenberry himself) seemed to believe, the crew of the Enterprise and human values were always shown to be right and "good", an alien society with alien behavior shows up? Expect them to be fixed by Kirk at the end of the episode.
Every storry does not require a multi-episode arc.
And the often cited allegories to 60s problems were so obvious and on the nose they make me groan, like the "Racism is stupid" episode with the black/white aliens.
Oh, and did you think the TNG episode with Riker's romance with the androgynous alien was subtle in its sociopolital message? That was a sledgehammer strapped with a grenade in Star Trek
How about the suicide of Yassim in DS9's "Rocks and Shoals
?" Gee, like the source for that death was missed by anyone.