I'm glad someone else noticed! It's not a drug, it's a religion.
You could take a cocaine or meth addict and say something bad about those substances to them, and it's no problem. But, if you dare say anything less than glowing about marijuana, they freak out and you are worse than a child molester.
A bit hyperbolic. You must be hanging around with the wrong stoners...or maybe you just give off an odd vibe?