Age really has nothing to do with this dispute. Bad neighbors come in all ages. People in this thread trying to bash old people are just wrong.
The Mrs and I purchased our current house last year and one set of our neighbors were complete dicks. We went over there a few days after we moved in to say hello and were greeted coldy and comments like 'the last people in your house were too loud and we had to ring the police, so take that as a warning'. Anyway since then their elderly parents had moved into a caravan in their backyard(which is actually against council laws here) and they don't talk to us at all but b**** about us constantly(we can hear them when in our bathroom). I got sick of being able to see this caravan and their slob parents every time I went into my backyard so put some lattice with shade cloth up on the fence on our side to block the view. A few days later I go out and it's all been ripped down and lying in my yard, so I go and ask and get a lecture about not asking to put it up and that I was blocking their view(they could only see my garage anyway...some view). I asked for them to either put it back up or pay for what they broke which made them aggressive. I rang the council first to see if I had done anything wrong and then decided to dob them in on the caravan. Long story short it turns out they were only renting(I never thought to check this) and have started to move out this weekend, I assume they were evicted, the owner has called in to say sorry and is taking their entire bond for repairs to the fence and the yard. So to the OP, you are not alone.. there are plenty of ******* neighbors in the world!
Agreed on the toilet, that's just nasty. I meant to vote for the neighbor, stupid touchscreen on my phone and big fingers.
Wow, you're neighbor is a huge dick. Be careful, he could be a killer... haha just kidding. Spoiler No, seriously.