Hancock is everything a hero shouldn't be - selfish, arrogant, and more often than not, drunk. In trying to save people, he usually ends up making it worse.
When a car's stuck on the railway tracks, and an oncoming train is about to smash it and its occupant to bits, Hancock does the right thing by saving the day. Only he does so by throwing the car (with occupant) out of the way onto another car, letting the train collide head-on (at full speed) into him, and thus causing immeasurable property damage and risking lives left, right and centre.
When the public rightly pull him on it, Hancock replies with all the grace and politeness you'd expect. First he calls them all stupid. Then, this happens:
Tubby bystander: "She should sue you!"
Hancock: "Yeah, well you should sue McDonald's, 'cos they f*&!ed you up"
Stay classy, Hancock.