That email was just the start of the crazy train rolling out of the station yesterday.  All day long, while I worked, he sent escalating hateful emails.  The next to last one he sent read; "Fuck you you crazy whiny bitch."
The last one he sent?  Said he still wished the best for me and pleasant dreams.
Keep in mind that I was working all day yesterday and had only responded to the first one he sent.
Needless to say, I didn't respond to any of the later emails.  I think I am good here.
Phew.