buzzing is very similar to the stupid joke your friend pulls when you're looking over the edge of a tall building and he\she comes up behind you and shakes you for a second to scare you. for a split second you get scared because you think you're going to die. then you have a laugh about it.
it's the same way with getting buzzed. only it's not your friend doing it and it's not going to be humours afterward. it's disrespectful and when it happens to me it gives me free license to spray them with my water bottle if i can catch up to them at the next light.