I think I've definitely turned into a Victoria Meldrew these days. So many little things irritate the hell of me, many already mentioned on here. Litter absolutely infuriates me - there's no excuse for it whatsoever. And as a dog owner, I hate the irresponsible ones who don't pick up after their pets - or even worse, bag it and then leave the bags or hang them on trees, bushes etc.
Oh, and after reading the comments about people having bonfires when neighbours have washing hanging out, a few years ago, we had ones who did that all the time - polite requests for them not to do it were just ignore, so one beautifully sunny day when almost everyone in the street had full washing lines and yes, they lit another fire, my husband went along and asked them to put it out. He was told, in no uncertain terms by the woman to 'go forth and multiply' - so he returned a few minutes later with a large bucket of water and poured it over the fire. She was speechless! He told her next time, he'd bring another bucket for her too - result, no more bonfires!