This is funny, but also fake - unless this person was truly pissing off the cooks! Their actual salads come in little wooden bowls and look like salads. You can image search it. They give you packets of dressing and everything. I’ve never ordered one, but eaten with friends who had dietary restrictions. They never got a plate this hateful, lol.
I took your advice and found some pictures of actual customer reviews, and it appears that you are indeed correct. While they might not all be the most glorious examples of salad craft in the world, they definitely look edible and miles better than what the Facebook OP would have us believe.
Waffle House has a bigger menu than most people realize, you just have to actually request a full menu. It's actually on the fine print on the menus.
I only know this because I worked absolutely awful shifts and the only place open when I got off was either Waffle House or another diner, so I spent way too much time with coworkers at both.
Pretty sure almost ANY restaurant will have a salad somewhere, even if they're 100% carnivore focused otherwise, because there's always that odd vegetarian that shows up out of nowhere and refuses to eat anything else.
Same goes for burgers, apparently. Even Red Lobster and Olive Garden have one on the menu, presumably for those awkward family dinners involving grumpy teenagers who didn't want to be there in the first place.