Why is Obi-Wan so mean?
In "A New Hope", he chops off Dr. Evanzan's arm when he could have easily mind-tricked him.
And there are a number of times in TCW we see him just being a bully to battle droids who aren't doing (and won't do) harm to anyone just for a laugh.
For a jedi master, that kind of behaviour is just...rude.