That is a really ugly thing to say about a group of human beings. Even about human beings who are each individually culpable of something bad. And Gazans, whether or not you consider them an ethnicity, are not defined by their actions but by accidents of birth and residence. Gazans are a group of human beings with widely varying backgrounds. There are newborn Gazans, and pacifist Gazans. There are lots of Gazans who aren’t culpable of anything deserving death.
Even Israel claims that every Gazan that they target is guilty of something, and that the others are innocent bystanders. Israel may be lying, but they know that they don’t want to admit to genocide.