Well they actually don't write that realistically, these are copy and paste bots that are just trying to farm karma so they can later sell the account (which I've heard is a thing apparently?). You can see the left is all original accounts by the uniqueness of their usernames and the copied posts on the right are all reddit generated names.
The left image is the original post, 10 months old, where (at least most) of the users are real people. Left is full of bots copying the post 1:1, comments included.