I don't know if it's "social media brain rot" or people have just lost comprehension skills but I've noticed this a lot over the years...

Most of the comments on a business post tend to be questions that are answered in the post. Some people tend to be in such a hurry to comment after a quick scan they don't stop to thoroughly read. Those people tend to be the only ones to comment.

*Addendum : Also, in this "pie sale" scenario, there is guaranteed to be at least one person to make an unreasonable request of the business, like they live and hour and a half away and want the pies delivered. So, they will have to add "In Person Only" to the next flyer.
Social Media only makes sense if you assume the other "users" are eally just bots.
I've seen people I personally know leave comments like this. I left them all behind when I abandoned Facebook.