Should this sentence be "Shit, Rick, Man." Or should it be, "Shit, Rick, man." I am aware the sentence isn't great but please humour me! Also is it, "Hey, man!" or "Hey, Man!"
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The only reason to capitalize "man" is to clarify that you are addressing humanity/mankind, as opposed to a single male human. An excerpt from an article which discusses the originally gender neutral definition of "man" to mean "mankind":
One interesting convention that was thought up in the early 1900s to deal with this issue of “man” coming to mean both male and female and also sometimes meaning males exclusively is, in literature, to do the following: when referring to humans, “man” should be capitalized as in “Man”; when referring to “man” as in “male”, it is to be left lower case.
This convention was used in such literary works as “The Lord of the Rings” and was a key point in the prophecy concerning the Witch-king of Angmar: “no man can kill me”, meaning that according to the prophecy a woman, Eowyn, could because “man” in the prophecy was not capitalized.
But it is a convention. As far as I'm aware, it is not an explicit grammatical rule.
The capitalization of "Man" (when referring to mankind) seems to stem from Man being a given name to our species. At least, that is my interpretation as to the justification of capitalization in the case of "mankind".