Except this meme says nothing about loving people through their worst times and they'll strengthen you in return. It says love every part of them. That's very different from fully accepting them. Even the wording is completely different because it's a different thought process.
You don't love the worst version of a person. You love the best version and understand they can get through a hard time back to the good. What you're describing is indeed a very healthy relationship which is what the rest of us are focused on.
This meme says you should love every part of them. That absolutely implies you should love their flaws as well. That's what we're calling out. Unconditional love doesn't mean you love the flaw, it means you love them through it, you see their strengths, you see their best, and you love them in spite of the flaws.
There's this weird mindset that corners of the Internet push that you will find this perfect person who's even flaws you enjoy because they complete you so perfectly. This image just screams that it comes from that corner of the Internet to me which is why I called it out and pushed back. Especially since I recognized the name of the poster, the same person who just a week or so ago was posting about how they view getting married as a cure for loneliness, which is super extra toxic to think someone else can make you happy like that.
It's also weird to think we haven't experienced unconditional love. I spent most of yesterday curled up in a blanket playing video games being pampered by my wife of 7 years because I'd had a rough go of things lately and she knew I needed a break. I was in the middle of that being loved in spite of not being my best self because she knows how amazing and wonderful I can be. I absolutely guarantee she didn't love the angry snippy version of me she had last week that led her to doting on me.