Their survival is a tribute to the religious tolerance of Islam. How many Islamic communities survived in medieval Christian Europe? As for modern times, a Europe that murdered six million Jews less than a century ago is in no position to vaunt its tolerance.
Ouch! Oh dear me...
First of all, that medieval Islam was sometimes more tolerant than medieval Christianity is a given.
After all, Reformation era Christians murdered each other by the millions, and on weekends went after Jews and Muslims.
But that was then.
And your comparison of today's Muslims to Nazi Germans is totally apt -- indeed some have argued that the Holocaust began with Muslim demands to their ally Hitler that if he wanted Middle East oil, he'd first have to get rid of his Jews.
And this is now:
The inheritors (if not progenitors) of the Nazi Holocaust -- radical Islam -- have worked since WWII to drive all non-Muslim populations (Jews, Christians, Hindus) out of Islam dominated countries.
In Egypt, for example, Copts were reduced from about 15% of the population 100 years ago to now maybe half that.
In short, Islam is becoming as intolerant as medieval Christianity used to be, while Christianity is today far more tolerant than Islam ever was.
If Europe were a Muslim land invaded by Christians, he might have a point. However, Europe never was a Muslim land, but much North Africa, Palestine, Syria, Lebanon and Turkey were Christian lands. Arab Muslims took over those lands, oppressed their native peoples and Christianity is persecuted and either waning or obliterated in all of them. Compare that to when European colonial powers held sway over Muslim countries and you see the Muslims did quite well by comparison.