For awhile it was the "unacceptable bigotry." Not that it didn't exist, of course, even among people who decried it, but it was unacceptable to be an anti-Semite in public life, and just bumping up against certain tropes was condemnation worthy.
I think arguably this was in part due to the fact that it was another tool used to beat the Left, but not just.
Watching that taboo fade away, with people arguing that Akshually, the real intolerance is not platforming ant-Semites, is quite disturbing!
