It was probably the one where Picard refused to play god for an alien race because religion was a primitive superstition.

Or the one where they recover cryogenically frozen people from the 20th century and Picard shits on a venture capitalist.

Or the one where an alien race is outcast because they don't conform to gender norms and this is a bad thing.

Or the one where an admiral starts a witch-hunt on board the Enterprise trying to weed out a conspiracy and Picard goes into an anti-fascist rant.

Or the episode of DS9 that takes place during the 1950s where Sisko experiences racial segregation, and Star Trek is a sci-fi story he can't sell about a future he wants to live in.

Or the one that establishes the Bell Riots, a widespread anti-capitalist revolt that takes place among the homeless and immigrant populations.