They do not want to just destruct Israel, they want to kill all Jewish people and want a purely Muslim country. Anti-semitism in the area existed before Israel was created and is a reason why it was created in the first place.
It’s just often ignored because Jews aren’t a group that people sympathise with. There are also many more Muslim people and even hinting that you do not support everything Palestine does, as a Muslim or not, can make you a target for lots of hate. There are even people who will tell you that you “aren’t a real Muslim” if you support a two-state-solution.