I had a neighbor like that once, Dana. He had just moved in and, after making small talk with me while I lovingly pruned a big rambler for about 20 minutes, he waited until I had gone inside and reached over the fence with loppers to chop it off at ground level.
I saw him do it from the kitchen window, so I ran out and asked him what he was doing. He said: "There are two things I hate -- cats and flowers."
Well, welcome to the neighborhood anyway, you jerk! He didn't stay here long, but he managed to alienate everyone before he moved.