I honestly think it's incredibly disrespectful to Jed & Yourselves and would be more offended about the incorrect spelling of his first name. To me it looks as though it is out of pure laziness and blatant disregard / disagreement for the way you have chosen to spell his name.

I think you have every right to be cheesed off about it. It is totally unacceptable and that behaviour from an adult is not something that a child should be exposed to - teachers are important people in childrens lives and get a lot of credit for the way they influence them.

What she is doing certainly isn't a good influence - for Nikolaus or any other child that sees it. She should act her age and show some flipping maturity and just spell his damn name right.