I came from a show barn years ago that was as corrupt as they come. Intoxicated trainers riding clients' horses, selling lame horses & scheming with vets for pre-purchase exams, swearing at students during competitions VERY publicly in front of other competitors, giving school horses "ace" on a daily basis when they grew sour... the list goes ON AND ON AND ON. However, if somebody asked me in person what I thought of the barn, I'd be totally honest with bad experiences I have had PERSONALLY (not rumors or other peoples' experiences)... but never EVER post anything on the internet & attach their name to it. It could get you in a lot of trouble, and many trainers/barns on a more professional & private level do research on potential boarders before letting you ride with them... if they see you trashing other barns, they may be hesitant to let you into their own in fear that you'll later trash them as well.
No matter how bad your experience was and how emotional it was... don't blackball barns or trainers on the internet or to people you do not know on a personal level. If people ask directly, tell what YOU went through... but leave other boarders out of it. But don't just throw it out there to "get back at them." It's unprofessional and could do more harm to you than the barn.