Perhaps that strawman exists. I know that we don't eat at McDonald's because we believe that factory farming[1] is inhumane and that grass-fed beef and dairy from animals that weren't stressed their whole lives is likely to be healthier. Also bad: large producers of animal products have been overusing antibiotics, leading to possible major problems for the human race in the future. McDonald's is not the worst in the industry, but they're still bad by these particular measures.
I totally agree that eating a McDonald's-like meal from time-to-time isn't going to wreck anyone's health. I also know that many people don't care about the animals, or can't afford the cost of well-cared for animal products.
I guess my point boils down to "all generalizations are wrong". You love McDonald's and that's fine. But your characterization of people who don't like McDonald's and their desire to purchase "their overpriced crap food" shows that you're not seeing another side to the story.
[1]: https://en.wikipedia.org/wiki/Intensive_animal_farming#Anima...