I wrote that for some groups that the bigotry went from minimal to mainstream. Of course, that does not mean that it was minimal for all groups back then, since it obviously was not.
However, it is hard to dispute that racism, whether open or covert, is greater now than before, and has official backing now, rather than bipartisan nominal disapproval (not necessarily effective, of course) in the past. The more obvious opposition exists mainly because there is more to oppose.