In response to my email saying I know of no way I'm infringing anything, I've been accused of admitting things I haven't admitted, told to find a lawyer and been told that flickr's terms of service
may cause my flickr account to be deleted.
I admitted nothing more than taking the picture in my email. He's done nothing to cause me to consult with a lawyer, and at worst he could get the picture pulled from flickr, not my account. Even if my account was deleted, I have all my pictures saved separately from flickr.
I denied admission of any infringing activities, mentioned fair use and told him to stop sending me harassing emails.