Bad Neighbourly Karma?

About one year ago, it seemed that any new place to which I might relocate would have fully functional construction sites nearby; it's what happened in RO, NL, and then PT.
Until last year. All of a sudden, constructions were either done or temporarily closed and it all felt relieving!
But this time around, it's a different issue altogether: earlier this year, some very unfriendly downstairs neighbours who were throwing a party in the middle of the night started pushing us around and swearing/ yelling at us when we went to ask them to turn it down a tad.. [And the rest of this story is better buried untold, as it brings back more-than-unpleasant memories].

Today, first thing in the morning, upstairs neighbours [tourists, mind you] start throwing stuff around the house. Sounds incredible? J. goes upstairs to ask them to calm down a bit and it all ends with the freakin' b*tch screaming at us along the lines of "Call the Police, if you will, but I couldn't care less!".
..
Now, in this new world we're living 'love thy neighbour' is obviously not applicable; but why should that turn to 'One must do all within one's reach to piss off the neighbour'?
What's the story, Neighbours? Is it Karma?

P.S. It's not only in Romania that walls are too thin, by the way. :)