Unfortunately this board is a place where if you give an honest, negative opinion based on experience, you will be flamed beyond recognition, called obscenities, and this by people unable to use basic grammar and punctuation. Most of them write their entire post in one sentence, and a lot of them use caps lock excessively.

Sadly the fact is when you give an honest, negative review on a product, you are threatening some Forrest Gump character's livelihood, he'll be making tons of money selling his rubbish, useless product to unsuspecting people who will then be disappointed having parted with their hard-earned money to buy his inferior/faulty product. Hence he will be very, very upset that someone would have an opinion on it, as that will potentially limit his income.

I could name a couple.. but like you said, it ends badly.