You're having a public bitch, on a forum, about a post on Facebook? Unless it's the UKC page itself, no-one can do anything about that, and even if it is, you need to report it on that page to save people trawling through every post to find the issue. - Note - I'm not a moderator or admin for UKC either on FB or here.
How about you actually talk to the person involved? They may simply be unaware and need a little prod in the right direction.