Agreed. He actually stopped reading it after two chapters:
https://www.looper.com/358395/the-real-reason-the-starship-troopers-director-never-read-the-book/
A long discussion on the politics of the Starship Troopers, and why Heinlein wasn't a fascist that the Left portrays him as.
Thing is, he was a liberal, which to Marxists is no different from a fascist.