Regardless, his description is completely off the mark. There's no "venting" in Mein Kampf. He details his experience during WW1, his period of hardship afterwards, and then explains the events that led to the rise of the NSDAP after he attended a meeting on the invitation of a fellow veteran/friend.
I mean, these people never mention how the nazis actively sought to occupy oppositional space by holding meetings and demonstrations in neighborhoods the communist party was very active. They viewed it as a win-win scenario. That exact same strategy is being used today: Berkley, etc.
All they can ever say is that it's boring, hateful, he's insane, etc. It's transparent that they never read a page. They could attack his fixation with cleanliness when he described certain areas of Germany or draw comparisons between the Bavarians who sought to turn the party into a Bavarian secessionist one early on to the Catalonians today.
I mean there's a wealth of topics and interesting parallels to discuss in the book, but they're never able to.