Every 'barn' I've ever encountered (3) has had drama in one way or another. Of course, I'm pretty oblivious to that sort of thing so there was probably even more under the surface that I wasn't catching.
Each had drama in different ways:
The first (where I took lessons for years, pre-Lacey) seemed to believe in a limited food per horse policy (I had no idea what a horse without ribs showing looked like, even after 7 years of lessons at this place. Up until I was about 16, I just thought that was the way "normal" horses looked!!

). There was also zero turnout for 30 horses so, as you can imagine, the arena was a crazy place.
I'm sure there was boarder drama - I mean, there were more than a few "oops babies" from a cremello stud that would sometimes "get loose" from his owner, but I wasn't a "real" boarder and I was a kid at the time so no one mentioned things to me.
The next barn, basically pasture-boarding, (with Lacey, this time) was different but not really much better. Similar food policies to the previous barn but the horses were fatter than the first barn - I thought I had found heaven! Haha
Pastures got crazy muddy, the BO did nothing. The BO's old toothless gelding (35 years old, at the time) nearly starved to death one winter because "no one could take the time to soak his food" and then also lied to the BO, who was laid up with a broken back, about soaking his food or not. Farrier visits weren't scheduled during the winter because "horses do better with longer hooves in the mud".
I 'lost' so many halters/lead ropes/etc at this place... They were really good to me while I was there (in terms of not charging me more than I could afford for board and sharing the little that they had with me) but thank the Lord I am out now!!
Next place, I just went there for a few lessons (as part of a class for school) a few years ago. That place also had zero turnout, lots of stable-vices in the horses, and basically every owner there was some kind of know-it-all. It was ridiculous. I saw more than one petty cat-fight break out because one know-it-all had stepped on the toes of another.
The BO there was also super pervy. He was always telling me that I had legs any equestrian would kill for and that I would make a "good wife" because I could "sweep the barn so well while looking so good." He was probably in his mid-seventies. It was just not ok.
Then there were the training practices at allll these barns. I won't even go there but it was bad all the way around.
I thank my lucky stars on a daily basis that I 'board' alone now, that the only drama I have to deal with is animal-related drama, and that I don't have to see another human during my entire time at "the barn" unless I invite someone to come with me.