At times, it seems that the arguments constructed in a couple of forum posts are full of hasty generalizations and fallacies. Whether someone belongs to ESL or some other clan, one should not judge others by their affiliation, emotional, or personal constituents that we have towards other clans. If you're going to discipline a player, make sure you HAVE evidence to prove it. Until you have that, the person should be deemed as innocent and a good player; whether they brag or not, it's not our problem. If that is something we really dislike, then the best thing we can do is stray away from that attitude and make the difference ourselves. There will always be someone like that in the server; the question is, can you deal with immaturity and demonstrate that you're a 'mature' player by sucking it up and having your actions speak louder than words? I know that many players are arrogant (perhaps including myself) and that it can make the game experience not as pleasurable, but using quantitative data can sometimes prove to be more effective than qualitative.
Pointing out contradictions in their comments proves nothing whatsoever. We all have them. In life, we only see what we are ready to see; therefore, unless you have tangible or visual evidence that someone is hacking, I'd say it would be a good idea to let them play until proven otherwise
Just thought I'd add something.