Anonymity leads to people being jackasses online. This is really nothing new, and has been around since the first MMO.

That said, I tend to remember the better groups I have had than the bad ones. And if there is a troll in your group who is being a detriment to your fun, you have every right to kick them.

Example, had a DRK in A1 who wasn't responding to us or talking, even with the MT asking him if he wants the .5 or the Oppressor. When it came time for the split, the DRK just stood there and continued to DPS Oppressor and standing in all the AoEs and caused us to wipe. We swiftly vote kicked him and got a much better tank.

Praise the good, damn the bad.