(I might be putting up a strawman here:) Seems to me that many of the people who're arguing for meat and against fruit/carbs/grains are oversimplifying things by just saying: meat is healthy food and lots of carbohydrates and thus most/sweet fruit is bad/unhealthy.
IMO anyone who seriously tries to argue that any of meat/fruit/carb/fat/.. is inherently healthy or unhealthy is arguing a lost cause.
Yet, people arguing that meat is healthy (while the world population is AFAIK hitting record numbers in obesity and dietary health issues) might well be getting at least *something* right, even though their oversimplified message isn't correct.
Many people who're struggling with obesity might be better off exchanging some carbs in their diets for meat (or other foods high in protein and low in carbs). Not because meat is somehow better food than fruit. But because the average person today doesn't burn enough calories to live on a diet that contains lots of calories but only little protein *without* ingesting more calories than they need.
I've come across a few slightly or not so slightly overweight people who seemed to think that they could lose weight by adding some more "healthy food" to their diet, meaning by that things like fruit. To a certain degree this misunderstanding is understandable, as fruit is (according to my perception) quite often being marketed as specifically healthy, while I cannot recall having seen an ad for some meat being marketed as specifically healthy.