Objective opinion. I'd like to see the qualification for that.
Speaking of qualifying, I've noticed a lot of people being proclamations of opinion with "IMO" or "I feel/think...." This is wrong. I understand the desire to appear humble and aware of your own subjectivity, but it isn't a help to communication when you spell out what ought to be obvious to anyone who's not a douchecopter.
And THIS IS JUST MY OPINION GUYS SO PLEASE DON'T HURT ME, but discussion should be driven by purpose. You can hop into a random forum, poop out a blurb about something you don't like, and think that's the end of that. That is when the term "fanboy" applies. Unless it's someone asking you what you want for Christmas, generally you should try and support whatever it is you don't like with reasons why. Failure to substantiate your opinion, subjective though it may be, is equal to adding "so there" to whatever precious sentiment you have.
So yeah, if someone popped in to a topic and said "All JRPGS are better than Westerns" and little else, the unholy label of "fanboy" would be pretty deserved.