It doesn’t matter if it’s popular. It’s still racist or nationalist. Just like people who say “fuck Palestinians,” you’re labeling an entire nation or group for the actions of their leader(s).
As an American, am I Biden or Trump? No. I’m an American. I should not be held accountable for the actions of the leader of my nation, even more so if I voted against them.
Netanyahu won his last election with 64% of the popular vote, and is currently polling at 15% popularity with the Israelis.
Hamas won the last election with 44.45% of the popular vote (similar to Trump, they won without popular majority).
I’m just saying words matter. “Fuck Israel” means all Israelis. I think you may just mean “fuck Benjamin Netanyahu.” In that, you’d likely have support of most of the world.