This happens everywhere. I'm a lawyer, and we hear all kinds of craziness (and not just from Sovereign Citizens, although that's my personal favorite brand of crazy). But there's also less systematic forms, more like common misconceptions...for example, the idea that an undercover police officer has to identify themselves as such if you ask.
When I first started learning Biblical Greek, my textbook said something that amounted to "if you think you've come up with an alternate translation that will fundamentally change Christian theology, the odds are good that you're wrong." I can only imagine the e-mails he gets.