My most reactionary opinions all stem from selfish people being annoying as hell in loud ways.
Vehicles (often illegally) modified to be louder than normal solely to be annoying is probably my top one.
The other worse noise in the world is the near constant droning from 8am-8pm in suburban areas of lawnmowers/leaf blowers/edgers/etc. Everyone individually mowing their individual lawns with their individual lawnmowers on their individual schedules. Lawns are the stupidest fucking things on earth. Insane waste of resources and a huge source of annoyance for literally everyone who has to exist around them