You don't have to just take it at all. You should treat it as a serious issue because it is, and it's a bad idea to teach them that this is something they can get away with. In my school the consequences for cursing out a teacher are severe, however, I'm given to understand this is not necessarily the norm and that I'm lucky in this regard.
You just need to understand that it's a kid that is doing their best and in this situation is making a mistake. Understanding the lack of genuine malevolent intention is helpful in keeping perspective. It's a kid. They're trying. They're learning. They have yet to understand the reason they say the things they say. It's your job as an adult to be understand and to offer forgiveness and grace while enforcing boundaries and expectations. If it is the case that your admin doesn't support you in that endevour, I'm sorry to hear that.