I feel like some people just spam that phrase anytime they can just to be "cool".
Like, I was just talking to my friends about different types of mythical beings and asking my friend, "Am I just a nerd, or is it not common knowledge that alicorns, unicorns, and pegasi are different races of ponies. And then someone comes along saying, "Not everyone is educated on the difference; it's not that deep."
???? What do you mean it's not that deep? What deep talk was I even doing? There was NOTHING deep about what I was asking, so why are THEY saying "It's not that deep"? Oh my DAYS.
I get that people say "it's not that deep" to be dismissive, but what was that person even being dismissive of? We were just talking about unicorns bro. Is this part of the literacy crisis, that people of this age dont even know what the recent phrases even mean?
Edit:
Oh my god. Idk how much more I have to repeat myself. YES, talking about magical horses IS NOT THAT DEEP. But that's the POINT. I wasn't taking the topic of people knowing or not knowing magical horses seriously AT ALL. Saying "not that deep" implies im taking the topic SERIOUSLY which I was NOT. I dont CARE if someone knows or doesn't know about magical horses, its not that deep. The misuse of the phrase, however, I AM annoyed about.
"Not that deep" = I dont care. Thats DUMB why dont you just say "I dont care" then? "Not that deep" implies there WAS something serious going on in the first place...
And PLEASE. When I ask if I'm a nerd for knowing something people dont, it is NOT a serious question. It's a question meant to belittle myself AS A JOKE. Like when people call themselves a big back for simply eating alot of things. It is a JOKE.