Rugby is, by its very nature, a physical, aggressive sport and most people appreciate the tough encounters. It's what attracts many people to play the game.
As a player you always accept a certain amount of physicality, and most players will do anything to get the upper hand on another.
That is what separates rugby from any other sport in the world - the ability to knock the stuffing out of each other, and then shake hands after the match and return to being best friends as you were before.
There is always a line with the rough and tumble, but in my opinion the unacceptable stuff is when you are in danger of doing serious damage to another player who is not in a position to defend themselves.
I think that players see a stand-up punch-up as what it is - it is the sly, cowardly and dangerous stuff that angers players. Or certainly angers me.
I have been eye-gouged a number of times and it's not fun, and very serious.
But I love any form of honest confrontation and if you come off second best, then that's the way it goes.
There's no point pretending skullduggery doesn't happen on the pitch. It does, but the dark arts are slowly disappearing, as there are more camera angles than at a Kim Kardashian photo shoot. And if players are caught then they should have the book thrown at them.
The kind of the thing I am talking about involves being cleared out of a ruck by your private parts, and as the assailant does so he makes it look like a perfectly legal clear-out.
The only person who knows what has actually happened is me, and it's funny how quickly you let go of the ball when you are compromised like that.
The sly thing of people treading on your hands can be pretty painful.
And sometimes, when players should be aiming to put their head underneath their opponent's head to clear them out, they instead aim for the head itself. I have received that a few times. Although mainly from my own team-mates.
Less bad perhaps is when you help yourself off the floor, but use an opponent to push yourself up - that's irritating rather than painful.
One of the worst things I've seen is a player try to land their knees into the kidneys of our scrum-half Joe Simpson, when Wasps were playing Stade Francais. That sort of thing is unacceptable.