I feel this issue is important as well, especially on GAME topics. I can't tell you how many times people go "thats just your opinoin" or "some guys opinion, no facts". As if every topic must be laid into stone with researched data and links to real people on a hotline 24/7.
On fanboys, i feel like the term is funny, since I am forever will be a Godzilla, EDF, and corny japanese show fanboy. But people use this like its an insult now, and what really ticks me off is how they use it sarcastically.
"inb4ps3 fanboys" is like people really think people have this almost nationalist approach to w/e topic the fandom pursues.