The guy obviously wasn't deliberately trying to impersonate you, and you just decided to lash out and antagonize him completely unprovoked. You are an starfish.
Why would he impersonate you?
It's best to not let this kind of thing bother you. Someone once had my name almost exactly, ß and everything. All I did was state (because he was new) that out names are really similar.He did not know who I was.(or he was a good actor)
That was not the whole chat in the OP.