Why do people start rumors online?

Catharine • There are two ways to behave: as if nothing is a miracle...or as if everything is. -Einstein
I've had this happen to me a LOT and can't for the life of my figure out why anyone would want to tarnish the reputation or business of someone they've never even met...
Why do people say one thing to my face and blatantly lie about me behind my back? 
What could they possibly get out of it? 
I redacted this to remove my personal information and accidentally removed the words "helpful information"...sorry! It's hard to draw lines on my phone 😹
I do own a bed and breakfast which is listed on several websites. I offer the rooms free on Couchsurfing.com as long as there is not already a paid booking, in which case, I put them up on the couch. 
It's not really a policy I hide so I don't understand the rage...or this man's expectation that I would just be like "sure, come on over! After this! 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors