I've not encountered this myself, but I don't think it would matter. My last name is usually mispronounced so I'd rather be called by my first name as it's pretty simple. What I hate is when some professionals, especially doctors, feel free to use my first name but are offended when I use theirs. I may not have quite as much education as a doctor, but respect is respect. If you expect me to call you Dr. So-and-so, be prepared to be corrected when addressing me by my first name.