I posted a negative review of a dentist on Yelp -- I stand by my feelings of having a VERY bad experience -- and the guy emailed me putting me "on notice" and d

I posted a negative review of a dentist on Yelp -- I stand by my feelings of having a VERY bad experience -- and the guy emailed me putting me "on notice" and demanding I remove it immediately, or else I'd be "dealing with [his] attorney." I never did remove it, and I never did hear from his attorney. But I felt outraged and scared (I was a few years out of college and had never received this sort of email before), and I will admit I didn't use Yelp much for several years, as I associated the site with risk of traumatic experiences. It gives me a sick feeling in my stomach and a headache just to think of all this again.