Read the meme again. "Explaining why weighting (sp) 300 pounds is healthier than every other lifestyle". Is someone actually arguing it's healthier than literally every other lifestyle? Are they doing it without qualifications? Did they not use some sort of logic to support their position? Or is the maker of this meme making an overly simplistic representation of an imagined argument someone might make, specifically chosen because it's easy to refute? That's what a strawman argument is. And they're not even using good logic to argue against this fictional claim!