@Ralphie01 surely the majority of posts on AIBU stem from people having a bit of a moan or just checking that they're not a miserable got and others would have reacted in the same way.
If you've got a difficult neighbour or a neighbour you've had run ins with before it's not necessarily a good idea to pop round and have a whinge about their shitty behaviour, not all neighbours are receptive to that sort of feedback.
The OP isn't the one who flounced off out their car, there was apparently no drama, the neighbour acted like a tosser then disappeared so OP reversed and had to wait for the neighbour to come out of the house and back into their car and move.
The OP could very well be insecure, or deranged or any number of things, but from the information given, and from what you've said, it sounds like the OP is perfectly reasonable to have a moan, perfectly reasonable in her behaviour in the situation, and it's you who sounds like you have nothing better to do!!
I should preempt and confirm that currently I also have nothing better to do, having already completed my evening jobs, and I'm lying about trawling Mumsnet!