Some people just cant adapt to the mutliplayer experience of the game and/or arent good at it, so they have to make up excuses to why they were killed and ban that way of killing someone from their server.
I remember playing 0.4.1 and i got kicked everytime from the Official server cuz i crouch glitched. The reason was it caused major desynch... If it really caused major desynch why wasnt a patch released to prevent it and why can you still do it in 0.5? Just another excuse to prevent people from doing it, just like the excuse for car killing, its noobish.