In a conversation with Jim Farley and Bernard Baruch FDR reminded them that Jews and Catholics were in the US as guests and were not a real part of America. He was replying to their worries about the predjudice each group had experienced and were still experiencing especially in the WW2 military. They were told it was best for both groups to accept their place in America.
The only difference between the East Coast Brahmins and the Klan was social status. They shared similar views.