Begin with the core framing that the dominant narrative is crafted around avoiding: the Zionist state is a settler-colonial project premised on apartheid and genocide. Personally knowing the history is valuable but the most important thing is to not be on the defensive from the get-go, as the true power of pro-Zionist narratives is in the implicit establishment of the validity, goodness, and justifiability of the Zionist state and presenting it as simply a victim of attacks rather than an oppressor facing resistance. It is also difficult, though not impossible, to respond to my framing using false accusations of antisemitism.

With this framing you can also draw analogies using other anti-settler colonial sympathies they might have. The fundamental nature of the project is not different than the white settler apartheid/genocide regimes in:

• The United States and Canadian genocide and apartheid of indigenous Americans

• The Australian genocide and apartheid of Aboriginal Australians.

• The New Zealand genocide and apartheid of Maori.

• The South African apartheid (not without its genocidal elements, but it's where the term apartheid comes from so I'll leave it there).

In theory, liberals are against apartheid and genocide and can recognize the absurdity of, say, trying to lecture indigenous Americans about how they shouldn't have fought back.