I get being annoyed at called a nickname that you do not go by, but for heavens sake, the person apolgized when s/he realized that Liz was not a nickname Ms. Becton used. It is not as if s/he continued to use it even after knowing that fact. Then I could see getting upset, but a one-tine thing? It is not worth it.

One a side note - My name has two spellings and I tend to get annoyed when people use the wrong one in e-mails, but not enough to go on a rant for several e-mails. Most likely all I would do is bold the spelling I use any reply.