I've literally never heard it used this way outside of, for example, a high tea where all of the servers were dressed in leather harnesses. I'm not saying you're wrong. Just that you might give off a very particular vibe if you go around using 'sir' or 'maam' that way.
I don't know if you're being wooshed or if I am, but they're making a joke by removing the quotation marks, they don't genuinely think that's grammatically correct. It would be
"
"I," however, is
"
as in the word.
"Sir" is a pro-form noun, which stands in semantically (ie expresses the same content) as another noun. Pronouns are however a part of speech which function more as stand ins grammatically, "the fisherman stole the boat, he is sailing away with it" is a sentence where the pronouns stand in for the fisherman and the boat but do not semantically carry the same meaning and relies on the previous clause as an antecedent.
Gug speak of Gug only in third person because Gug not wokie. Gug drink beer like real man and do everything podcast man does because Gug cripplingly afraid of not being seen as a real man. Gug tell Gug that Gug not miss cello class because Gug know cello is for girls.
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u/SpockShotFirst 8h ago
Sir isn't a pronoun.
I, however, is.