Basically it's like this:

"Woot I do 800dps tank dps FTW"
"LOL noob don't do that u're stressing the healerz"
"LOL noob my healers are good they have no troublez, you should just get gud"
"LOL noob f*** you"
"LOL noob f*** you too"

Healers & DPS: "wtf's going on there? Why are they arguing over a petty 300~400 dps increase? That's like...LOL who cares."