It is a genie. That’s exactly what it means when she says “replace all the water in the world with milk”. Genies hate people. They are malicious spirits that have been imprisoned by sorcerrers to serve them and their wishes. The only thing is that it probably isn’t going to work because they are not omnipotent and have limited power usually. Enough to “fulfill a wish” of a greedy dude and fuck them over in the process, but not enough to destroy the universe.

Is there a difference? Because there isn’t to me. Wishing death upon anyone makes you a bad person who stoops to the level of someone wishing it to you.

Yup, plenty of people celebrate death or wish it upon people and then start getting defensive when called out on it. Human nature to be a cruel asshole and manage to convince yourself that you aren’t.