The two question zionists need to be explicitly asked are:
Hypothetically, do they even believe it would ever be possible for Israel to commit genocide?
If so, what characteristics would it need to have in order to qualify as genocide?
If they answer no to the first one, they expose their complete bias and therefore unable to even argue their position effectively.
If they answer yes, then they have to explain why the genocidal traits of what Israel are doing are not genocide, which might hopefully make them more introspective.