I've read Mr. Mounk's book. Or at least skimmed it. 

It is a long complaint about how he can't feel at home in Germany as a Jew.

There was no way Mr. Mounk was going to feel comfortable anywhere but the US, where as an immigrant society with short historical memories and even less historical knowledge, no one cares about your history.
Not so in the rest of the world.

Particularly in Germany, of course. But it is clearly a "can't win" situation for the Germans. He is offended when they ignore the fact he is Jewish, and offended when they don't. Offended if they aren't appreciative enough, offended if they are too appreciative. etc. The Germans cannot possibly be casual about it, the young have had guilt drummed into them, and that makes for strained relations.  You can't unwrite history, but the more you keep harping on it, the more strained relations become, to everyone's detriment.

That's what we should learn from this.