My JW little sister is like that. She would forward EVERY chain-letter, EVERY "joke" email, EVERY hoax, etc. To her ENTIRE email list - everyone in the congregation, her family, friends, coworkers, etc. Not to mention those JW "experience" and "urban legend" emails.
It all came to a head when she forwarded a couple hundred people (including me) that incredibly stupid "Microsoft will pay you $245 for each person you forward this email to NO REALLY IT WAS TOTALLY ON THE NEWS!" chain email. I sat her down and was like, "This is Snopes. You need to check Snopes. You need to stop spamming people with everything. It's rude, and irritating, not to mention what you sent them was completely false. You need to JUST STOP. Seriously, you're 22 years old; how could you possibly believe this is a real thing? You should apologize to all of the people you just forwarded this hoax to. You do not need to auto-forward everything you receive to everybody you know."
Yeah, she got hysterical and started crying and screaming at me. She did not apologize to anybody. She kept forwarding hoaxes and chain emails and pyramid schemes. And then she got scammed by somebody in Nigeria who wanted to buy a desk she listed on Craigslist, and all she had to do was cash his fake money order and send him back the difference and the desk...(no, lest you ask, she did not question why somebody in Africa wanted to buy a cheap mass-produced Ikea desk from L.A.)
You get the picture. They're gullible, and often kind of crazy. And they don't take constructive criticism well. The trifecta.