Just be glad your not Princess Michael
she got to choose what her "official name/title" would be, IIRC. And she chose that one to get a Princess title. She could have been called Firstname, Duchess of Kent (or whatever it is she's married into)
As for all the <whispers>"i love it" - why are you whispering? Surely feminism says that we can all decide how we prefer to be addressed? If you want to be subsumed into Mrs His-Initian His-Surname, that's up to you and i won't argue with you about it. If you don't but prefer Mrs Your-Initial + His-Initial His-surname (as my 80+ year old mum insisted on right from when she first married in the late 50s) then more power to you. (and kudos to my dad who argued with the bank about this when they didn't want to)
And for everyone who wants a different form of address, not limited to, their academic title + professional name - good for you. Stick to your guns.
OP knows her friends, she knows they are doing it to get a rise. To get a rise back i'd send them all back as "not known at this address". It's a PA answer to their PA addresses.
For anyone who thinks it's a waste of time to be bugged about this, it is a miniscule portion of my time. I have variously, today, been on to the village council about horse shit in the road, been on to the town council about the way their vans were parked so a neighbour couldn't get past in their wheelchair. Other things bother me too, to a greater or lesser degree. But that is the wonder of an internet forum, we can talk about all sorts of stuff.