Is it normal that the neighbor's child bullies me?

Until you mentioned the kid throwing rocks, I was like "So what? It's a kid." I'm not typically one for getting the police involved, but I would warn the parents that if the kid throws rocks at you or your vehicle that you might call them.

Be sure to set up a camera if you actually intend to follow up on the threat.

Get a camera and record that shit. Every time you catch him on camera doing property damage, report it. Don't do anything physical to the kid. The parents and the kid are probably banking on the whole "he's a kid, you can't touch him or you'll automatically be in the wrong" bullshit. Don't give them that opportunity to sue you or get you arrested.

Tell the little shit you'll slap the ugly off his face. Then if dad confronts you tell him you'll slap him too

Unfortunately, some people are like that... and don't care that they are like that.

I am not going to offer any advice on how to handle it as that really depends on specifics about them and you that I don't know; and the chance of getting it wrong and making it worse is high.

But, for every situation like this... there is a way to effect change that depends on the personalities and values involved. I admit that it may take some time for you to figure that out, and if you get it wrong you will make it worse - at least short term.

I wish you the best with this.

I had a teenage girl in the neighbourhood "bully" me for a while too. No clue why she'd just yell whenever she saw me and try to get my attention, most likely noticing i'm a person who dislikes attention. Kids can be real little shits.
No clue what to do really. In my case it stopped when she saw me with a guy I dated briefly, maybe she thought he looked threatning (in which case I can understand her lol..) so she backed off just in case. Otherwise my plan was pretty much to eventually confront her preferably with her parents around so that they would feel ashamed of their kids behaviour and give her crap about it later. As a kid I could act the same, most kids would. They don't have the common sense we do and the same understanding of consequences, they're just having fun and playing around but if they notice it gets to you then some kids will find it fun to keep doing it to you specifically and waiting for a reaction. If nothing else works you probably need to go directly to the parents if you know whom they are, make them feel ashamed of how shitty their son is and threaten to sue them for the physical attacks he engages in. They do not want to get sued and will get pissed at their kid.

You could tell the parents that you'll sue them if their child doesn't stop throwing stuff at you. Try being polite about it though. I know they don't deserve that at this stage, but hostility might only provoke them into bitter acts of spite.

And then as for the verbal abuse, you could try laughing at him when he insults you. That'll show him that his insults have absolutely no effect on you whatsoever, which should make him feel powerless then. He may also feel stupid, since it shows that it was clearly a lame ass insult. I wouldn't insult him back, but if you did ever want to reply then you could use his age against him. You could say something like "I think it's past your bedtime kiddo, run along home now" or something like that. Don't sound too bitter though, that'll only show that his insults did affect you and got you angry. You're an adult after all, you don't have time to be messing around with stupid little kids.

loooool, seriously though just turn the hose on him. Both the son and father will probably respect you more.