While LordTheNightKnight is taking this much too far (as always), he is right about the "opinion disucssion". You can't just slap "IMO" or "I think" in every sentence and say "It's my opinion so it can't be wrong".
It's funny because I'm currently taking a philosophy class called "Logic" and we discuss how arguments can be verified and falsified.
"I like trees better than grass because trees are red and grass is yellow which is ugly IMO" is easily falsified. Yes, it's an opinion, but it's still wrong.
In short: an opinion based on a false premise is an invalid opinion.