I agree it was anti-semitism.
My initial thought was no but then I came across an example of anti-semitism, which is: holding the Jewish people as a whole responsible for the actions and policies of the state of Israel.
So I put myself in the shoes of a Jew (having a Jewish father it wasn't that difficult, really, nor was knowing what anti-semitism FEELS like, growing up in an anti-semitic Eastern European society with a Jewish last name. There's more but...). Being blamed for something I had no part in simply for who I was certainly would look and feel like anti-semitism to me. This is one part of the IHRA definition I agree with (not the part that includes criticism of Israel though).
Clearly, anyone who thinks that Jews in England or Canada or wherever need to be punished for the actions of Israel are absolutely wrong and demonstrate hate. If I as an ethnic Hungarian - even if I were the most ardent Orban supporter, as some of my relatives back home unfortunately actually are - living in Canada, minding my own business and not doing anyone any harm, were hated so much just for being Hungarian, that someone would want to harm me, I'd say they were anti-Hungarian bigots for lack of a better word. And Hungarians don't have the history of being persecuted and killed in pogroms for who they are so of course the reaction from Jews would be even more visceral.
I have a lot of sympathy for innocent Jews and for Israelis too you might be surprised to learn. I just don't understand the Zionist mindset of recreating Eretz Israel at the expense of all of Israel's neighbours and Palestinian natives, who are paying a very heavy price for being Israel's neighbours and natives of the land. Did I mention elsewhere that I think that's wrong and unjust too? And that I'd like to see the cycle of violence and hate stop in my lifetime?