We were probably all brought up to regard it as very rude to misspell or mispronounce somebody's name. I certainly was.
However, it does seem to be something that those younger than us have never been taught.
My parents landed me with two foreign Christian names and a Scottish surname that only very few people have. It has two spellings, ours without the a in Mc and they other branch of the family that uses the a in Mac.
I spent my entire childhood spelling my name; moved to Denmark where I only had to spell my surname, but also had to put up with it being written with a full stop after Mc, however many times I said that this is wrong.
Don't get me started on letters placed in pigeon holes or hotel bookings! The only letter anything for me wasn't under was M. The Royal Library in Copenhagen being the sole exception, as they always list foreign surnames as they would be listed in the country of origin.
Now, having a Danish surname (DH's) I only need to spell it when abroad.
Yes, it still annoys me when people do not take the trouble to spell my name correctly. What irritates me even more is receiving post or e-mails addressed to Mr two obviously female Christian names Grandtante!
I'm not making it up, this happens now and again. Not even secretaries seem to be trained to write names correctly and to read through anything they have written before dispatching it.