If that was what you were actually doing, i'd agree. But it's the constant, deliberate drip, drip, drip of conflation of the Israel/Gaza conflict with British and other non Israeli jews that is gradually normalising anti semitism and specifically leading to the rise of anti semitic behaviour.
You can oppose Israel and also anti-semitism, aparteid and genocide, but that's not what you're doing. What you're doing is raising the Israel/Gaza conflict every time a connection to Jews arises, and that sort of sinister, insidious behaviour is blatant anti semitism, no matter how much the left try to deny it.