my mom got banned from facebook a month ago for having, months earlier, enthusiastically replied to a friend's post about some upcoming trip with a hyperbolic comment saying she'd "sell a kidney to be able to go with her". after helping her resolve the issue (had to clear all fb cookies, otherwise she was just presented with a blank page, making even beginning the unbanning process impossible), I warned her, next tim…
I don't think Facebook let's you know why they banned someone specifically, or do they? It could be; you assume it would be for this comment, but it's not outside the realm of possibilities that something else triggered it, right?
EDIT: found the photo my mom took of the ban screen https://i.imgur.com/VeA3Nz2.png