Well let's see, there's an episode with a dockworker's strike, in which a "negotiator" is sent in who's position is basically "I'll pretend to ask nicely but the only tactic I have is this in-universe law that says I can use the military to force you back to work." The letter of that in-universe law (the "Rush Act") is "The local military commander can break strikes by any means he deems necessary." And Commander Sinclair decides to pay the dockworkers what they demand out of the military budget of the station. So the union ultimately wins.

There's several times when some character, often a human but sometimes an alien, walks up to some other kind of alien and says "We don't want you FREAKS coming in and stealing our JOBS!" and they're always depicted as obviously in the wrong. Basically in the script it says "A Republican happens, and gets dealt with."

There's a whole episode with a religious exchange, all the various aliens are invited to demonstrate their planet's "dominant religion." When it's the human's turn, Sinclair takes the alien crew down a hallway with a long line of various different kinds of priests, ministers, monks, etc. The first guy in line is an atheist. The point being "Earth is diverse as fuck, yo."

The show just barely glances off a lesbian relationship, and the show's attitude says "What? You didn't have a problem with the five other romantic couples we've seen so far, what's your problem with this one?"

Oh, then there's the whole major plot of a socially conservative president sliding Earth's entire government into totalitarianism with the backing of a hostile alien race thing.