I can't stand people saying "It's not that deep" in any conversation ever

It's a toxic conversation stopper that somehow became a trend. Especially insulting is if it is used by your partner or a friend. I see it in reels and memes online - even here on reddit often masked as some kind of a positivity thing, but it is NOT.

If at any point in a meaningful discussion you say "It's not that deep." do not expect it to continue.
In my opinion, this should only be used as an insult to somebody who talks out of their ass and not something you say mid-discussion, especially when talking about an important topic.