Look, I don't really wanna get bogged down in Tory-Labour, Republican-Democrat, "is being opposed to certain issues and members of the Irsaeli government anti-Semitic" conversation. I really don't. But as a US citizen who follows US news closely and world news incidentally, I'm aware this is an entire topic of discussion. I expected it to be a section of Corbyn's page- and it was- but there's a whole Wikipedia article about it, so you can judge for yourself.
My personal read is, it ain't much different from some stuff in US politics. A bit of horseshoe theory stuff, not that I buy into that at large. But on the right you have politicians making alliances with neo-Nazis, on the left you have fervently pro-Palestine politicians. Both sides are or can be partially motivated by xenophobia, neither side is immune to having a theoretically defensible view possibly motivated by actual prejudice. I myself have been called an anti-Semite over disagreements that I believe to have little to do with religion and much to do with the actions of government agents. So it goes.
Looks like they recently made up: "UK Labour Party is pro-Israel again, says chair of its visiting friendship group"
"After antisemitism drove Jews away in Corbyn era, MP Steve McCabe says opposition party has returned to traditional Israel-backing stance, but is concerned about the new coalition"
There are entire Wikipedia articles on the history of Labour's issues with anti-Semitism- I know, because my link to one was posted before your reply was. The issue is much more nuanced than what you or the person you're replying to are implying.