Its just not that binary and people change their minds (intentionally and unintentionally). Let’s say you meet some people and you’re not sure if you’d like to date any of them, but you at least know you’d like to get to know them and hang out more. Then after getting to know them (likely in group settings) you then realize that you’d like to date one of them. Then you get the courage to ask and they’re not interested and just wanted to be friends. Sprinkle in some apprehension here and there and then you have the meme. It’s not as black and white as immediately categorizing people you meet as “friend” or “carnal” and then sticking with that label forever. None of this is static and we’re all just making it up as we go.