Someone used my old name in public. Have I reacted appropriately?

Hey folks. I thought I was only going to use this account to document my SRS recovery but I guess I have a question about something else as well.

A few days ago I went to get a chest X-ray (for SRS, incidentally). It's important to note first that I'm stealth (or at least trying to be - I think I'm mostly successful).

Anyway, while I was waiting the receptionist called to me across the waiting room and asked "Your other name is [old name] right?" I suppose she had that written down for whatever reason somewhere and wanted to check that it was me.

I'm fine if she had to check my previous legal name. Y'know, shit happens. But I'm not fine with her basically telling everyone in that waiting room that I used to have an unambiguously male name, and therefore pretty much telling everyone that I was trans. I would have preferred it if she called me to the desk. I just replied with "That is no longer my legal name" and left it at that.

Tbh I was pretty upset by it and I wrote a complaint to the local radiology group. Also I wrote to my GP asking for advice.

Anyway, my question is, was I right to make such a big deal over it?

Thanks