Good point, @JustTheTicket
But what if there is something going on with the problem boarder that the OP actually needs to know about?
For example, there was a teenage barn worker at the barn where I was teaching who just.plucked.my.last.nerve; who was particularly awful about following directions. No one told me she has significant cognitive problems, and that the barn is her refuge and therapy. Once I had some solid information about HOW to communicate with her, things improved. It’s easy to say that someone should have told me BEFORE I had negative interactions with her, but it’s an extremely busy barn with a lot of teenage helpers and a lot of contract workers. Going to one of the owners earlier with a question like “Is there something about Teenager A that I need to know? I have a really tough time getting her to follow directioins.” would have yielded the helpful info a lot sooner.
That conversation goes like this “BM or trainer, I’ve had some really unpleasant encounters with PB. Is there some history or issue there that I need to be aware of?” No need to kick off gossipy barn drama.
To reiterate, we all know that boarder or boarders. And we all, even the most grown up, articulate and assertive of us, sometimes have trouble using our words and addressing conflict directly. So until there’s more info, maybe it’s premature to demonize the OP or conclude she is the problem?