I'll bite, Safety.
Your first point is valid and I said the same thing myself but your reasoning is odd. Categorization is fine. Prager's problem is that his categorization makes no historical or philosophical sense. I'm on my phone so I will just engage one additional point for now: race. It's the first example he uses. You clearly have something to say but how it applies to anything Prager said in this video isn't clear. Prager argues that race is anything but insignificant for the left and he's obviously right. Race plays a strong role in leftist discourse and leftists see many issues through the prism of race. What exactly do you find objectionable about that observation? He does imply that it's racist to acknowledge the reality and impact of race.
That goofy insinuation is worthy of the progressives he despises. I'll grant you that but the real objection here is that he engages in the very behavior he condemns. You know, the same tit for tat stupidity that makes this forum unreadable at times. Beyond that, what's the problem? What is this about hate propaganda?