Too bad, trans people are more important than your pottertreats. If trans people say something is hurting them just stop doing it. Don't get into the nitty gritty of "how much harm does it do really?" make as wide a distance as you can to it.
As for this specific instance its not even hard to see how it is harming trans people: talking about hp keeps it in the spotlight which generats more sales.
Why wouldn't you purge the franchise that funds trans genocide from your life??
Trans people: "this is doing harm to us please stop!"
Cis: "Is it really though? Asking people to quit their pottertreats is just alienating stop being so dramatic!"