Risa

The first episode of Trek I ever saw was the ToS episode with aliens that had half-white and half-black faces and were engaged in a race war over which side was which. It has never been subtle, and for good reason. Nuance generally doesn't work well with bigots. If you want to get people to examine their beliefs you need to shove the mirror in their face.

The only thing that's changed is what is getting shoved in your face. ToS doesn't make you uncomfortable? Good for you, you're not a Jim Crow level racist. Some of the new stuff makes you uncomfortable? Maybe you think about why it makes you uncomfortable instead of complaining about it.

A little off the point: I actually think it's less in your face. In the episodic series when they did something along these lines it was usually the main focus of the entire episode. With the newer serialized seasons it's usually a b-plot. They can devote a little more time to the b-plots when they have a whole season to resolve the main story but it's still not the main focus.