Is it Possible that Chemtrails are a Reverse Mandela Effect?

The conventional explanation is that these are contrails naturally created by the moisture from airplane exhaust.

I remember contrails from the 1960s. I don't believe this is a false memory, because it is confirmed by numerous photographs and reports, and the fact that jet planes are more likely to leave contrails than turboprops. Yet chemtrail advocates claim that the contrails are cause for concern because they are new.

I am wondering if this is an example of a reverse Mandela effect in which people are forgetting rather than remembering.