Because, for some reason, people think it’s better to smooth over social situations by acting inauthentically than handle any amount of friction or disagreement. But that’s how people end up with entire friend groups they don’t relate to, and feel unhappy.
Personally, I think most people lack the emotional maturity to act authentic to themselves and say ‘fuck the haters’. People who do that tend to end up a lot more satisfied with life than chronic people-pleasers. I would know - I’ve tried both ways, and the people-pleasing only leads to anxiety and shame, like the OP’s meme describes.
I take the opposite approach. If I notice someone is more chatty than I am, I make a point to tell them upfront “hey, I’m usually pretty quiet, but I still enjoy conversations even if they’re a little one-sided”. It’s a good test of character - if they still have a problem with me after I communicated clearly, then we’re not compatible, and I don’t need to worry about them. But I have certainly had friends that would talk my ear off and I’d happily nod and offer small insights or facts, and it worked out. It’s more about finding the right people - instead of trying to become the right person.