Seems strange to me that people would hold Seagal Sensei under such tough scrutiny though most of us here have not studied with him directly or indirectly but at the same time will not hold our own 'heads of organizations' to the same scrutiny.
You did notice that no one responded to this, didn't you? It's a very good point. Until you've trained with Seagal, you really don't know anything except was is presented to you. To some he may be a jerk, but to others he may be great. To each his own. If I ever get a chance to train with him, I would do it. Just because he's hard, doesn't make him a jerk.