Moderator decisions are not up for discussion, particularly in public.
Generally, you're safe if you treat other members of the site with respect. If you do step out of line you'll be contacted by a moderator, who will let you know what the problem is and suggest you stop doing whatever it is you've done. If you continue to push your luck you will be banned. The exception to this is if you're straight out spamming, in which case you'll be banned immediately and without warning.
I have posted this in case you were worried that there were unknown bannination potholes you could fall into without noticing, not as an invitation for a discussion.
This thread is now closed.