You need to respect a person's right to be stupid...
where "stupid" is your assessment of their belief. It's a matter of tolerance. After all, some of your beliefs may be considered stupid by others and you want to be left alone to hold them.
You do not have to respect the stupidity itself. And certainly you do not need to accept actions based on that stupidity which affect you directly.
Alex
"There is a cult of ignorance in the United States, and there has always been. The strain of anti-intellectualism has been a constant thread winding its way through our political and cultural life, nurtured by the false notion that democracy means that "my ignorance is just as good as your knowledge."
-- Isaac Asimov