My opinion is that being against anyone on the basis of their nationality or ethnicity is wrong.
No arguments with that. What about being against the actions of Zionists? Is that wrong?
What "actions" would those be? The desire for self-determination on ancestral lands is not an inherently harmful idea. Isn't that exactly what the Palestinian people want? Not to mention Tibetans, Kurds, Catalans, Cypriots, Western Saharans, and First Nations peoples all over the world.
Holding the ideology that ALL people have the right to self-determination on ancestral lands, is, in fact, a balanced, equitable, fair ideology which harms no one. The harmful ideology is the one which denies that right to a specific group of people. The harmful ideology is the one which claims a people don't exist. The harmful ideology is the one which labels an entire group of people as evil.
The OP is not making an argument for incorrect ideas or actions. -- the OP argues that the Jewish people, as a whole, have inherent traits such as anti-humanity, anti-love, anti-justice, etc. The OP argues that the Jewish people are evil.