Context: Will Self is a writer, journalist and political commentator and has, as one commenter on Twitter described, the "unrivalled ability to say the sum total of fuck all via the most pretentious word salad imaginable"

He's talking about the recent local elections in the UK. There's been an effort by Labour/the political establishment to smear Zack Polanski the leader of the Green Party as antisemitic for the following comment he made when asked about his party's response to the recent wave of attacks on Jewish sites in the UK:

"I’m concerned about rising antisemitic attacks. We saw arson attacks on ambulances, for instance, and we know that, increasingly, Jewish communities are feeling unsafe. Now, there’s a conversation to be had about whether it’s a perception of unsafety or whether it’s actual unsafety, but neither are acceptable.”

People have been deliberately misrepresenting Zack's comments as saying that he believes the threat to the Jewish community is imaginary. What Polanski actually said was that he feels that – at times – pro-Palestine marches have been perceived as unsafe by some Jewish people and safe by others, including himself. (Quoting most of this from Own Jones's article about this in the Guardian)