It concerns me that anti-Semitism is treated more seriously than other forms of persecution, especially when the holocaust is invoked to justify it (though I'm not saying that's the case here). Anti-Semitism should fall under 'racial discrimination' or 'religious hatred', both of which are valid offences to prosecute. And let me be very clear, I am not excusing such racist comments in any way - I find them abhorrent. I just think it's dangerous to treat anti-Semitism differently to the hatred of Muslims or black people, especially when it is used to shield Israel from any criticism.
There's a cultural question when it comes about knowing why anti-semitism is treated differently. Jews often consider themselves as the oppressed choosen people, it's in their culture (I'm not talking about religion there), I have some Jewish friends whom I talked about this, and they agreed. The direct consequence is that they are extremely vocal about any kind of agression against them, hence the perceived difference in treatment.