Just because you have cleared something, doesn't make you awesome.

I'll provide a perfect example. Last night I joined a Shiva EX farming party. Our initial group was amazing. We literally one-shotted the fight at least 15 times before one of the tanks had to go raid. So, he dropped and PF opened back up. New tank joins who has cleared Shiva EX (not to mention T9). Multiple times he kills half the people in the party (and ended up causing wipes each time) because he wasn't smart enough to know that when Shiva pulls out her bow, you DON'T AIM HER AT THE PARTY. Party leader ended up kicking the tank (after we asked a few times to stop) because this person (who had previous clears) was causing us wipes, when we had not wiped one single time before with the previous tank.

That is just one of many examples I could provide that shows that a win does not equal knowledge or skill.

However, I do agree with Ellatrix's disdain for people who try to sneak in farming parties trying to get an easy win. I have no patience for that either.