Would the slang version, yessir, of yes, sir, be deemed as derogatory, offensive, or simply disrespectful to someone your senior?

Solution 1:

1. It is definitely a word:

   yessir

   Syllabification: yes·sir

   Pronunciation: /ˈyesər, ˈyesˈsər

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   Definition of yessir in English:
   EXCLAMATION

   1. Used to express assent:

      “Do you understand me?” “Yessir!”

      1.1. North American Used to express emphatic affirmation:

      'yessir the food was cheap'

2. I tend to think that it would be, as the whole point of saying yes, sir, in the first place, is to show respect. So it would stand to reason that using the slang version, yessir, that logically it makes sense that it would be, if not derogatory, offensive or disrespectful in certain situations.

   That said, I might be thinking about it all wrong, as from the link above, it states that it's used to express emphatic affirmation. So maybe they are equals where yessir is simply just a more emphatic way of saying yes, sir.

Solution 2:

I'm not sure about you all but the short answer to this based on my personal experience is that is has become derogatory, offensive, and disrespectful.

In the past, people used to say it looking you in the eye and with sincerity. Now it's like it's a sarcastic way of saying "screw you, you're not the boss of me". Most cases, the person will be walking away saying this, not looking you directly in the eye or at least facing you. Sad state of affairs we live in today. Almost everyone I've come across says it in a negative and inscincere tone.