Yes, I agree with you! Calling someone you don't know well by these over-familiar terms is, in my opinion, utterly disrespectful and tantamount to bad manners! ?
I was born in 1957, and brought up to show respect and good manners to everyone, especially older people! That included not using over-familiar terminology when addressing people I didn't know well! ?
To this day, I still feel uncomfortable calling friends of my parents - now in their late 80s and 90s - by anything other than their formal title, and I am nearly 64 now! ?
Even as a child, I was rather pedantic, and I am probably even more so now that I am a "senior"!? However, in my opinion, respect, good manners and common decency are never old-fashioned! ?. Unfortunately, these are things which seem to be sadly lacking in today's society! ? Just my personal opinion, I don't expect everyone to share it!