Some things you just have to put up with unfortunately, for your own peace of mind, only you know which elements that annoy you are really petty, but the planning breach you don’t need to just accept. It sounds like he wants to wind you up, reacting will give him a cheap thrill and make him do other stuff all the more. The more you react, the more he will think stuff up to do. I would keep a diary of events over time so that if anything really serious does kick off you have a record of who, what, where, when etc and also note against it how it made you feel at the time (keep it honest, if you react, note that too). A diary helps paint a picture for police, councils and judges should it ever come to that, it might help you release some of the pressures you feel. Try not to be obsessive about it though, these things can take over your life If you let them.
I would just report the planning breach providing you know for sure action can and will be taken, so talk to your council first for advice. Everything else, try to turn the other cheek where you can, try not to react, hopefully he gets bored of his pathetic behaviour that way. If his biker mates are regular visitors at certain times of the week leave your car on the road across your own drive at those times so they can’t block it.