Everybody's mileage will vary on this ... I spent a lot of time in the year after I read Paul Graham's essay on "things you can't say", searching for things that I thought matched the criteria he set out, and found a few. But it's not that the words may never cross my lips, I can say these things within some small circle of people, but would definitely not be saying them in public without being prepared for an onslaught of negative attention. Some examples of 'cancel culture' are proof of this. Donald G. McNeil comes to mind.

That said, I'm not impressed with the notion of Straussian memes and agree that way better examples are needed to give the idea some validity.