I was very lenient on the Russian board and allowed some individuals to engage in long drawn out fights that added nothing to the conversation and cluttered up an otherwise useful information source with inane name-calling clutter. I did the same thing on this board some time ago. I'm not going to make the same mistake again.
Omar has been banned for personal attacks against others he apparently disagreed with.
If someone disagrees with someone else, by all means, they should state their case, but they need to do so civilly with constructive argument rather than by resorting to personal attacks. It's generally those who can not make a case to support their views who resort to these tactics and these people add nothing of value to the board. They will be banned unless they contain their anger and avoid attacking others.