Is Calling Someone Their Last Name Disrespectful?

[IggyWH]

I got into this discussion with a guy I work with the other day. He thought it was disrespectful because someone he worked with calls him by his last name.

I personally don't see anything wrong with it and I call many people I know by their last name. I thought this line lies with old school/new school type thing. The guy I was talking to is 35 but I would definitely consider him new school as he's in a death metal band.

Do you consider calling someone by their last name disrespectful? Is there a defined line to when it's okay and when it's not?