Prejudice has been around since people have been around. Prejudice against Jews has been around since Jews have been around.
Yes. Without long-standing prejudices against the Jews it would have been virtually impossible to demonize them in way that the Nazis did and to try to exterminate them. From a social and political point of view, one cannot simply pick on any group and exterminate it. It has often been said that antisemitism is as irrational as hating people with red hair, but of course 'redheads' have not been demonized and persecuted.
The word is antisemitism.
how long has deforestation been around
As long as guns have been around.
As long as So Random has been around.
how long has the london eye been around for
The usual disintinction is between (traditional) religious antisemitism and racial antisemitism. The latter arose after religious toleration was accepted in most European countries and religious antisemitism lost much of its force. Racial antisemitism arose from about 1870 onwards and operates with conspiracy theories.
The word is anti-Semitism, or better antisemitism(as there is no such thing as 'semitism' that Jew baiters are 'anti').
234 years fool
how long have boxing been around?
boner
They have always been around