some trivial things :
1. People that chew gum with their mouths wide open, i find this disgusting
2. People that forcefully work their way into subways without waiting for people to exit first.
3. willfull ignorance
4. during business meetings, when a co worker just did a 20 minute rambling and now is finally giving me the chance to answer ,he or she interrupts me 5 seconds into my answer to continue rambling on something they seemingly forgot to mention. Hate that.
5. My wife putting the knives with the sharp side up in the dishwasher. Stop doing that !