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If, somehow, the work manages to feel just as relevant today as it did then, if not more so, it's an example of Values Resonance, not this trope.
Obviously films and TV shows done in black and white, or non-high definition, as well as video games, will automatically be dated for technology reasons, but if we listed them all we'd be here all day.
Compare also Last Het Romance, where the incompatibility causes a character to discover they're gay and break off the relationship. If a character informs someone about an Incompatible Orientation, it's either Sorry, I'm Gay or Dude, She's a Lesbian.
A work set in the present day at the time of its creation, but is so full of the culture of the time it resembles a deliberate exaggeration of the era in a work made later.
While a joke about a president who is long remembered may have many years of life, a joke about a news story that isn't well remembered 20 years later except by the people who were alive at the time or paying attention, or based on a then-popular but now long-gone ad campaign, wouldn't - inverting Don't Explain the Joke because the explanation is necessary.
This means that Incompatible Orientation doesn't have to be a permanent state of being, and attempts may be made within the plot to "fix" it somehow.So it would be best to judge them more by content and plot.