"Adjectived" Identity

Reading for Wednesday's class, I found the articles to be overwhelmingly true. Now I am not currently nor ever have been a girl that participates in the comic book/heroic movie scene but when it comes to the "adjectived" identity that these articles discuss I am completely onboard.
For the entirety of my life I have always been so confused why people feel necessary to add such descriptions to people, and not just in gender. For instance, if someone is telling a story about their day more often than not if they are talking about someone they interacted with they will say "this black guy" or "this mexican guy" instead of simply stating that they interacted with a guy. By having to add these adjectives we automatically are implying a "guy" is a white guy. The article about "strong female characters" really struck a chord with me because like the article says this implies women aren't inherently strong.
These descriptions of people are completely unnecessary. No two men, women or children are alike so why generalize them with an adjective like black, strong, sensitive. People are a lot more than a laundry list of descriptive words strewn together from an outsiders perspective so why use any at all? Let the  "guy" you run into at the gas station be a "guy" and leave it at that.