To be annoyed at being addressed as "Mrs DS's Surname"?

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This is my first time posting so please be kind. I just wanted to know if I am being unreasonable at getting annoyed about my DS's (5) teacher addressing me as "Mrs Smith". Names changed to make it simple to understand without giving away real names! My DS (sadly) has his dad's surname "Smith". His dad and I split up nearly 2 years ago now. We were never married and so my surname is different to my DS. This upsets me anyway as I hate not having the same name as him. Despite my telling his teacher a number of times (has to be in excess of 10 times now) that my name is "Miss Jones" she still continues to address me as "Mrs Smith"! It drives me crazy. She did it again this morning and I said nothing this time because I'm starting to think she is doing it to wind me up. What should I do??!? I've even broached the subject with my ex today of changing DS's name to be "Smith-Jones" except it would be a terrible name as neither of us have great surnames. Needless to say he was not keen on the idea. Do I just need to woman up and get over this?? . Just to add this happens at other places other than the school too (Drs surgery etc).

I don't mind so much if it is the school, although usually they do remember, however I do get annoyed that my Mum writes the wrong name on cards. I never changed my name when I married but my Mum always put my husband's surname on anything even though constantly reminded her, it's now even more annoying as we are separated and she is still putting his name on things, you would think she would be more sensitive as she changed her name back to her maiden name after me and siblings left home (she divorced when we were young).

Bit of a namechange fail there, OP.

Why does this annoy so many people? There are weekly threads from married women proclaiming that they kept their last name and should be addressed as such. It's ridiculous. Get on with life, no one actually cares and it really does not matter.

Lol. Yes realised that Costwoldstrife

Lol. Yes realised that Costwoldstrife

Lol. Yes realised that Costwolds

As you can see I'm new to this.....apologies for the millions of posts!

YABU. You need to think of DS's surname as his and forget about his dad. She probably has a large class and does well to remember every child's name let alone their parents'.

Why are people so concerned about surnames these day? It is just a name, everyone has one, none are particularly special, nobody is bothered about anyone else's.

I have a different surname to my kids because I kept my own. I have to say it doesn't bother me. The one that amuses me is DH being called Mr Ex-DH's surname when he picks my DCs (but his step DCs) up. He doesn't care either!

Schools don't have to get it wrong. I actually don't mind particularly if called Mrs DHName at school, as it's an easy assumption to make since the kids are DHName as well. But since the teacher found out I am not that, she now calls me "Mrs Myname" (I would prefer Ms Myname, but I don't really mind!). She's quite scatty, and she manages to get it right (ish), so it can't be that hard.