Yes. It was awful, and I couldn't avoid this person, so it was a battle of wills that lasted for about 4 years.
We are in the same home school co-op and for whatever reason, she singled me out mean-girls style, and had her clique of friends start rumors about me so I was basically ostracized by everyone until I was able to change their opinions about me (after a ton of hard work). She even "accidentally" removed my name from the group's mailing list out of pure mean-ness. She actually pulled alot of rotten stunts on me, some costing me money. I think her goal was to either make me a lacky (sp?) or just leave the group. I didn't budge, and wrote off the money loss as a "donation" at tax time to the church the co-op is affiliated with.
I suspect she was trying to establish her turf and show me who was boss, as she is one of the Queen Bees in the group. I unfortunately don't fold over easily and didn't put up with her immature games. I mean are we in high school or what? I found it very discouraging as this group also has a Christian focus, and it really challenged me spiritually because I couldn't believe women who claimed to be Christian would even stoop as low as to do some of things they were doing.
Over time it backfired on her. She was an officer in the group, and apparently had wielded her power to the point where she wound up losing alot of friends.
We're both still in the group, but she lost her post as officer. The group is so big, that now that she's out of a position of power, I'm not bothered by her too much.
I suppose I could have had a face to face confrontation with her, but I think that is exactly what she wanted. So I took the turn the other cheek route, and it seemed to be the right choice in this situation.
Sure there are still jerks in the group, but I don't need them, and because it is so big, I can pretty much navigate around them.
As for why adults choose to be bullies? I think they have unresolved mental issues, and are probably troubled and in need of help. This behavior, just like in children is a cry out for attention. I find bullies are very needy and emotionally draining and demanding. They are so hungry for fulfillment (whatever that may be) they are willing to hurt others to fulfill that need. They are definitely getting something psychologically out of it.