Or do you believe that people who support the Labour party are more prone to antisemitism than anyone else?

I believe that Labour has a particular problem with anti-Semitism, because the leadership and many prominent members have acknowledged that fact.

Remember the report Labour commissioned into anti-Semistism in the Oxford University Labour Club? We discussed it at some length.

The NEC has just decided not to implement its recommendations.

The Oxford Student,
"The news that the two members of OULC who had been accused of anti-semitic acts have been cleared by the Labour Party's disputes committee was revealed by the Jewish Chronicle last week.
Baroness Royall reacted to the findings with dismay, saying "I am deeply disappointed by the outcome and fear it will further harm relations between the Jewish community and our party by confirming a widely held view that we do not take antisemitism seriously." "

http://oxfordstudent.com/2017/01/30/labour-mps-wade-oulc-anti-semitism-scandal/