sorry but i had\ to laugh when you said you feared for his safety! And go your daughter for being a brown belt!

Now, on to the issue.

You did the right thing talking to the school.

Can't help but wonder if he's calling her these names cos he likes her. backwards i know but that's kids for you.

At the moment, all you can do is be there for your daughter. do you know his parents? If you do, i really suggest you try and talk to them about what he's saying cos they probably dont know.