Say I did believe that climate change was a hoax. What then? Should I be excluded from the community? Should it be used to question my decisions, destroy my career, hound me for it? Should it follow me around?
I don't believe that, but your logic taken to its conclusion doesn't paint a pretty picture for the world. I wouldn't want people to behave like that to each other. Being able to disagree is a fundamental right, necessary for discourse and debate to work at all. If you vilify a position you lose the benefits of this.