It's not their ideals it's that they express them in a way that's counterproductive and designed to draw attention to themselves and not participate in a discussion.
Let me give you another example of this type of behavior. I personally disagreed with many of the decisions the Bush Administration made in the U.S. I have had many thoughtful discussions with people who thought differently and have, in some cases, changed their minds ever so slightly. The guy down the road from me shares my ideals but he expressed it by hanging a life sized doll of George Bush by a noose outside his garage and then eventually lighting it on fire. I assure you he convinced no one who didn't already agree with him and his actions were really just a thinly veiled cry for attention.
The guy down the road might not have convinced anyone directly but he did contribute to your cause by making the need for discussing GWB ever so slightly stronger in your community enabling you to do what you did.
No need to deride an entire class of your peers simply because their ideals are different than yours.