Web definitions of a
naysayer - someone with an aggressively negative attitude.
http://wordnetweb.princeton.edu/perl/webwn?s=naysayer
naysayer - one who consistently denies, criticizes, or doubts; a detractor.
http://en.wiktionary.org/wiki/naysayer. 
Personally, I don’t hate any of the following but here goes,
Google: “i hate primerica”
Result: About 315 results (in small print below the Search bar)
Google: “i hate rbc”
Result: About 1,670 results
Google: “i hate future shop”
Result: About 2,720 results
Google: “i hate fido”
Result: About 4,690 results
Google: “i hate canadian tire”
Result: About 4,730 results
Google: “i hate td bank”
Result: About 8,070 results
Google: “i hate tim hortons”
Result: About 8,550 results
Google: “i hate macintosh”
Result: About 9,650 results
Google: “i hate safeway”
Result: About 11,400 results
Google: “i hate home depot”
Result: About 46,500 results
Google: “i hate microsoft"
Result: About 374,000 results
Google: “i hate charities”
Result: About 5,620 results
Google: “i hate kittens”
Result: About 63,000 results
Google: “i hate god”
Result: About 514,000 results
Google: “i hate children”
Result: About 561,000 results
Google: “i hate sex”
Result: About 1,380,000 results
Google: “i hate naysayers”
Result: About 1,630 results
Google: “i hate chat rooms”
Result: About 18,400 results
Google: “i hate blogs”
Result: About 316,000 results
Google: “i hate threads”
Result: About 525,000 results
This exercise was done on June 3, 2011. The numbers can fluctuate.
Yes, I can see why people hate Primerica. They’re amateurs. Not enough Primerica going around to hate.