Thanks for the replys. I see I'm not the only one who can get irritated over neighbors. I also have a landlord who I could tell you a hundred stories about how he has been. And I know everyone else could, too. I usually say hello to neighbors and even do it first many times just to keep an open line of communication. I figure I might need to talk to them about a problem between us sometimes so saying hello helps. I even welcome them and have given some little gifts I'm proud to say. One lady I gave some veggies from my garden.
Some neighbors, though, and some landlords I completely ignore and even go out of my way to stay away from. The ones who are trying to make trouble for me in an obvious way. I will sometimes look the hallway over out my door to make sure some of them are not out there.

I'm going to continue to speak to the ones I want to and even make friends with some if they are my kind of people. Like I mentioned before, I think there's a silent war going on between neighbors and drivers. When I notice stuff like that I try to make an effort NOT to follow a negative or pejorative way of acting. Setting a good example, too, catches on I noticed. They tend to take out their frustrations on each other I noticed and look for an easier target. They can't tell off their boss for fear of losing a job so they take it out where they can or think they can. That's a psychodynamic defense mech. called "displaced anger." I recall it well from my counseling and psyche classes.
Then there are genuine reasons, too, to feel annoyed with one's neighbor or anyone for that matter like SlimMan, and others mentioned. Being the target is another reason to feel irritated. Who likes that nonsense?
I have a couple of doozy neighbors now and don't say hello to them because they have treated me badly. Maybe some day that will change but not right now. I've already called someone about dogs barking continually. I didn't really want to but I needed to get some sleep. The people would leave the dogs out at the crack of dawn and they would bark for hours on end and all day long. The dogs were also very close to my window. They were given instructions on how to handle their dog by the city kennels and I noticed they started taking the dogs out in their car after that.
I've gotten real mad at neighbors and drivers, too, at times but am making a conscious effort to show more understanding these days. I try to show some tolerance and understanding because I'd, too, like those things shown to me.
Thanks again for the replys.