Well as that user prowls the forums looking for any and every way possible to have a go at the game or anet, instead of just moving on and playing something they enjoy, I'd say sarcastic.
I just dislike the whole "rep" thing more than I dislike multiple guilds. It creates problems with guilds wanting you to rep them all the time.
It would have been better, in my opinion, just to show as offline if you weren't representing that particular guild. Sure, atm, you can whisper people online, but representing elsewhere, if you want a group etc... but usually if you want to do something with 1 guild, then you'd represent them. It's annoying both as a guild member and leader to see the people who don't want to rep at that current time.
If someone tells you that a mob does not cleave, then it would be safer to go melee on the boss, as it's attacks will only hit the person the aggro is on.