How can I prevent entity from getting in a boat

every entity enters boats. this is a minecraft rule

Adult camels don't so that's false. There's probably a custom code way to do it, but I'm not sure exactly how

Looks like it's hardcoded...

:/

It is possible with a mixin though,

@Mixin(AbstractBoat.class)
public class AbstractBoatMixin {
	@Inject(method = "tick", cancellable = true, at = @At(value = "INVOKE", ordinal = 0, target = "Lnet/minecraft/world/entity/Entity;hasPassenger(Lnet/minecraft/world/entity/Entity;)Z"))
	private static void tick(CallbackInfo ci, @Local Entity entity) {
		if(entity instanceof Zombie) {
			ci.cancel();
		}
	}
}