As you may know, I'm watching the news and politics pretty much all day every day, but I don't see much of a mention of AS. That might be because it isn't discussed as DB says, or it might be that there isn't much of it about.
It would be interesting to see a paper / report on the levels of it now.
I do wonder if AS is more of a middle / upper class issue rather than a working class one? That could be why we have seen it in politics etc but I don't witness it in the pubs like I do with racism against black and Asians?
It was front and centre for the period between the 2017 and 2019 elections.
It was one of the few attack-lines that stuck against Corbyn and is a difficult subject to approach from the left due to concerns around Israel/Palestine hovering around the edges of what is and what isn't antisemitism (no hyphen btw).
A number of Labour MPs stuck the boot in - notably Margaret Hodge and Ruth Smeeth (both Jewish) - and there has been a continuing campaign against the left of Labour with a number of people being expelled. One obvious question that arises is why are some of the people being expelled high-profile left-wing Jews?
Both Hodge and Smeeth are now complaining publicly that the Campaign Against Antisemitism (an NGO focusing on the subject) is unfairly targeting Labour now that the lefties have been booted out. They're struggling to square the circle without admitting the whole thing was made-up (or hugely exaggerated for effect).
Most studies show that antisemitism (along with racism in general) is much more prevalent in Tory circles but as no-one expects any better, it gets brushed under the carpet and stays out of the headlines.
As to your last question, I don't think AS is a class issue. The working class hard-right are still quite vocal about Jews owning/running everything. It follows the same logic as the immigrants simultaneously taking all our jobs and coming over here to sit on benefits. Schrodinger's Racism.
It's been seen in politics because it was effective against Corbyn where other smears weren't (and again there was a whole host of Schrodinger style accusations levelled at him e.g. architect of Brexit and ineffective on Brexit; a minnow on the World Stage and an unseen hand manipulating everything behind the scenes). Once you realise that the accusations had no grounding in reality it all starts to make sense.