After drinking lots of water and having some breakfast I have remedied my hangover. So I will put my previous post in a short and sweet version:
Yeah it's just a game, but using it as an excuse to be a jerk or otherwise alienate others is total *** and is unacceptable. Have fun with friends, and if drama erupts for whatever reason, remember you can always save yourself alot of grief and just log out and do something else. There's more to life than FFXI.