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What is that supposed to mean?
PPL with a slow or unstable internet connection are AFAIK meant to play 0 A.D. (hence the rejoin option - if I'm not misstaken).
People who leave the game and don't rejoin within a given ammount of time should simply be handled as losing the game - since they are not playing it.
I'm quite sure "noob" is a plain insult and should be avoided - even if noone specific is pointed at!
Same goes for "trolls" IMO - ask a moderator and they can handle the case if seen fit.
And in general: Identifying players that don't fit well in a particular game is not as easy as looking at some stats IMO... and definitely a matter of taste.
I think this should be an exception rather than a common practice, since it may be inconvenient for other people (especially when profile image is also changed and there is no signature or other info to identify the person).