It seems this is now quite normal. Now, I don't have a problem with it, but my children didn't do it, and I wouldn't have dared!
I remember, when I was about 15, my mother's friend told me to call her Margaret, as calling her Mrs Smith made her feel old! My mother was not amused when she heard me, and I was told off in front of everyone!
A new definition of what constitutes British

). At 91 she is still a formidable woman!