I once found a ball of pubes half way down the cabin as I was checking for any left behind belongings!!!!!
The things I hate have already been mentioned like nose picking during demo. No matter how much you stare at them they don't realise how discusting it is. Do they think we're blind?
Also taking shoes and socks off inflight and putting feet up on chairs or on the bulkhead. It really pisses me off!
The worst was when we were disembarking from Madrid and a girl came up and said i'm really sorry I wasn't well and I said that's ok don't worry and she gave me a bag that was completely full and really hot. Just as she went the smell hit me. It was like a raw fish market on a hot day. I couldn't eat at all that day, the smell just made me heave!