I suspect there have been many instances of poor anchoring techniques that lead to confrontations of all sorts. Judging where your boat will be or should be when anchoring is somewhat an art. A lot of these stories have been fascinating.
However, on the other side of the coin, I once anchored in a small cove in the San Juan Islands (WA). First one there. Dropped my anchor and let out the proper length of anchor line. Then another boat came to the cove--enough space for the two of us. Then some more boats arrived. Several anchored close so I pulled in my anchor line so as not to swing so far. A power boat who had anchored nearby watched as my anchor line got shorter and shorter and then we dragged. He yelled for us to come along side and had us tie up with them. With an apology for anchoring so closely, he offered to have us rafted up for the night and then proceeded to have us come aboard for drinks and a fresh crab dinner. It was all very pleasant and I slept well, wither from the secure tie up or the drinks I'm not certain. But we made friends for life and he taught me much about catching dungeness crab.
Not all close anchoring add up to arguments, loud music and stern stares. This one added up to friendship and some excellent crab dinners over the years. I took what this power boater taught me and in the years since have several times had a smaller boat come along side and tie up for the night. We've made many friends.
By the way, bagpipes don't scare boats away--I play the pipes and many times they come closer after the evening tunes.