For me it would have to be violence, I don't understand why you would hit someone, I understand that some people have to in order to protect themselves but apart from that I find it unforgivable.

Cunts will be cunts, if you hit them a couple of times it might help you vent your frustration but it will do more harm than good, nothing can be achieved by starting a fight.

And people than hit women/children/animals are...I don't know, I can't even put it into words how awful they are.

How about you, what's the one thing you can't stand in other people?