Few people, as this thread illustrates quite well, "hate" the constitution.
I'm for tolerance and provocative discussion, but I'm not for these people getting to live tax-free based on their personal cult of hatred. Nothing they do directly benefits the community. They make it clear that they don't even try to help their fellow man.
There are plenty of other ways people can and do discuss the same things you're emphasizing that don't involve emotional terrorism on vulnerable people.