i would like to see some sort of definition worked out for what is unacceptable behavior. 

annoying in guild chat? no offense but that would be a shit ton of our group, and then were would we be come ZG day.  

poor instance behavior and playing skill? i know i have wiped a group or two in my time, but i have tried to learn from my mistakes.  

misrepresenting fse to pugs and such? i certainly dont want some one causing people to think fse is a load of ass-hats, but how do you monitor that?

i like the idea of having a chat with the offender, as to who does this i am not sure.  i hear uda when he says he doesnt want people whinning to him to boot people, but i also dont think the accuser should be giving the chat.
if there is bad blood between people, that might just make it worse.  
maybe a discussion thread about the issue, followed up with the guild massa assigning an officer who is on the friendliest terms with the offender to have a talk with them.

might also be helpful to have a posted guild code of conduct...something simple and to the point i.e.  dont group with strangers to ninja loot, listen to pointers from officers, learn your classes role.

i dont know..my 2 cents