It's this easy to be banned from a group?

I rarely post anymore because of the vitriol. This morning, I was encouraged to read an article if I don't read anything else. I read it and responded with this:

http://www.democraticunderground.com/?com=view_post&forum=1107&pid=62593

I was immediately banned from the Hillary group for giving an opinion in the most polite way I could. I realize that the group is for Hillary supporters. But please, people, if you want to change people's minds, a response to the post other than immediate banning would be appropriate. Don't want to enter into a dialog? Don't be surprised when people just can't pull the lever in November. I would really like to like Hillary, but right now her supporters are as much of a deterrent as she is herself.