There's a certain squeamishness some have about eating something labeled as "lab-grown", as if it's somehow tainted with "unnatural" origin.

At the same time, there's a certain machismo, bravado, "manliness" associated with eating meat from an actual animal, mainly a vicarious association with hunting, but also by demonstration of some certain kinds of "alpha male" traits (access to resources to afford it, dominance, etc.). Lab-grown meat wasn't hunted or butchered, so may be viewed as "easier" in some sense--less manly, in other words.