The original CHIPs series was a fairly standard crime drama for its day, and while the new movie does have a plot which could have been something seen in the series, that’s all clearly surrounded by Kristen Bell’s cleavage and Dax Shepard’s ass, which are things you would not have seen on TV in 1979.
It’s far from uncommon for fans of particular TV shows to be unhappy when their favorite series gets a film adaptation.
This is especially true when the adaptation takes a significant number of liberties with the source material.