Why do people take things so personal?

I try and help people to the best of my abilty. This is what i have learned from people who have more experiance than me. I also show good forum netequette. I do not flame people and if someone gives incorrect information based on their own experience i merely point the fact out in a mature fashion since it is based on their opinion......

So why when i make a mistake or post something based on my own experience do people not do the same, i always wonder why some people hate posting lengthy helpful replies. They are afraid that someone will come and, excuse the phrase", shit all over them rather than being civil and pointing out they made a simple mistake........