The posts here that try to muddy the waters about what we do and don't know and what we can and cannot predict very far into the future are the best demonstration of the "dumbing down" that they are supposedly decrying.
Yes, we are being lied to. When activists and politicians start using scientific research results to "prove" their positions on matters that affect the public, they are typically misrepresenting the degree of certainty and too frequently misrepresenting the actual facts. And that is a "bipartisan" trait - all sides seem to be willing to do such things on just about every political issue.
And, they sell all sorts of ridiculous ideas, such as the Moon inching away from Earth is affecting our climate in the short term. If you really want to understand how the orbits and axis wobbles of Earth and Moon have influences on our climate, read about the Milankovitch Cycles. But, don't believe the people who insist that they explain everything, either. The geological records indicate that there is more to it than we fully understand at this time - probably related to the different atmospheric and oceanic circulation patterns that can develop under different conditions.
The people who are saying that others have been "dumbed down" are demonstrating that they, themselves, are incapable of even the rudimentary ability to quantify the effects they are proposing. And, when that is pointed out, they try to defend their credibility by impugning the abilities of people who are far better educated, far better informed, and much more capable of rationally testing such thoughts.
So, on the Internet, where everybody is anonymous, claims of credentials cannot be verified, and there is no accepted objective source for unbiased fact checking, what is a reader supposed to do with conflicting claims in posts to a thread?
My suggestion is that you look for people who can explain the bases for their positions clearly and quantitatively. So, that is what I try to do. But, it takes time to do that. People who play loose with the truth can post far more B.S. than people who try to post science lessons that are understandable by non-scientists.