It’s not a fine line at all. And I say that as a Jew.
Most Zionists are Christians because they need the temple rebuilt and all the Jews to return to Israel to fulfill prophecy and have Jesus return.
That said, what this person did say is entirely unacceptable. Especially the part where they say that we should be grateful they’re not murdering people. Sorry, I’m not going to thank you for not committing murder.