Wow. That has to be the most confusing comment I’ve ever seen in CR history. I refer to Ziongate’s.
As to the OP, you don’t speak for all of us when you imply that nobody thought there was Antisemitism in America. Most of us were never that naive.
The ADL statistics have always shown pretty significant portions of a population as harboring Anti Semitic beliefs, especially in minority communities. The last release of data that had a headline of something like “spike in anti semitic incidents last year!” actually showed a decrease in assaults. The increase in incidents was entirely from the internet giving people a platform to harass.
It seems like what you’re saying is that political correctness once protected us from hate speech, and now it’s gone. I don’t believe this. The internet has been used by Anti Semitic trolls probably since the days of dial-up. It has recently gained a lot of attention in efforts to convince everyone to associate it with Trump.
There has been openly condoned Antisemitism coming from places like Chalie Hebdo, Atheist comedians, South Park, and Al Jazeera for years. Those are what desensitized people from it, if anything.