Yes to the bold part. I mean, if you stopped reading the minute you disagree with something, there would hardly be a book left you could finish!I stopped abruptly about halfway through Liberal Fascism. I had recently finished JFK and the Unspeakable. Liberal Fascism at the halfway point started criticizing JFK, believing Oswald was a lone gunman communist instead of a CIA/MIC patsy, and arguing that JFK would not have prevented the Vietnam war. This shows me that the author does not know important, basic facts, so then what am I supposed to do with his arguments based on his misunderstanding of the facts. I guess it's like evolution where I have to mentally correct the author's mistakes as I am going through the text.
That being said, there are quite a few things worth criticizing about Goldberg's book: he's a conservative pundit and has an axe to grind with everything "left". And frankly, this whole left/right angle isn't really that useful when talking about fascism, except for debunking the leftist narrative that Hitler was a "continuation of conservatism", which is nonsense. Nazism was a form of communism minus internationalism, with some right-wing elements added (obsession with cleanliness, racial ideology and so on).
All in all, I found the book very valuable in giving some historical perspective on authoritarian policies that are usually justified and even celebrated by the left. It's an insightful read especially in this day and age that is so thoroughly dominated by, well, liberal fascism.