There was an example posted upthread about a piece of graffiti in Hackney which read "Free Palestine" being reported as antisemitic, and given some of the statements from eg Suella Braverman, I don't think it's that outlandish to suggest that some reported antisemitic acts aren't what most of us would consider genuine, even if they are just waving Palestinian flags.
Again, we should be able to condemn real acts of anti-semitism like those posted by
Kid_Eternity while recognising that not everything which is reported as such is genuine.