A few of my recent dislikes...
1) the scum that stole the catalytic converter from my boss's husband's car at some point last night/early this morning. Parked up in the Crown Plaza Hotel's car park at the NEC and they also hit another car at the same time in the same car park.
2) Lane jumpers. Having just spent ~3 1/2 hours each way to the NEC and back, idiots that jump from one lane to the next, with or without signals, into the smallest of gaps just to 'get ahead' when traffic's stop/start/crawling along. Not sure if it's worse in front of you, or when you catch them within a whisker of taking you from behind!!