Star Trek certainly had moments back in its day that’d be considered politically incorrect now. But I’m talking about at the time.
Political correctness is about being sensitives to the attitudes and cultures of underrepresented populations. People can put whatever bs interpretation of it if they want, but that’s what it is - treating people with respect. And that’s what Star Trek has always strived for, even if it didn’t always hit the mark.
Ex. They put a Russian on the Enterprise during the height of the Cold War. Now, the execution wasn’t perfect (pretty stereotypical portrayal, looking back), but the mere fact of the matter was a ballsy move to promote inclusion.