Why are terms like "Dear", "Hon", or "God Bless you" considered offensive?

I’ve never understood why people get offended when they’re called names like Hun or Sweetie or are told things like Bless your heart or God bless you. I don’t say them myself, but people always apologize quickly if they say it to me. I am an atheist myself, but I still see being told something like that as a compliment, and I’ve never heard of anyone saying any of those terms in a malicious manner.