Thanks for linking my post :D!!
Backing your opinions with knowledge and passion is a must... i've seen plenty of people that, when asked why they think a certain way, or where they learned that knowledge their answer was always the same: "It's what people say" or "i was taught this way", when further asked they got angry and left the conversation... I always try to back up my knowledge, and, if i realize that i was wrong, i just say sorry... why is it so hard for certain people to say "sorry, i was wrong"!!
I think i never left the "why?" age that children have when they are young, i'm always asking "why?" and "how?" to other people's opinions, it sometimes gets on their nerves a little...
And again, thanks for reading my post :)