I'm so sorry that was frightening for you.
It may be that he was just messing with you because you seemed scared and he was feeling racially profiled for being young and black.
I have a hunch that this is going to turn into a thread about racism and I'd just like to say that this is a great opportunity for the OP to learn a bit more about some of the racist assumptions that we all make, and that we all need to look at these and face them.
We all need to understand more about how our own children
will experience racism in their lives.
We all need to look at our own racist assumptions.
This is an excellent link to check out.
Anti-Racist Parent - for parents committed to raising children with an anti-racist outlook