Synth_floyd said:
How about this?
Girl: "My favorite band is X." However you hate that band. Is your response:
a) "Me too!"
b) "Uh, yeah they're okay."
c) "I don't like them."
d) "Worst. Band. Ever."
From all the "be assertive" advice the correct answer would seem to be in between C and D but it seems really rude to just rip their favorite band. I assume you should assert your true opinion but not do it in a way that makes you sound like a dick?
Now, that's where guys usually go wrong.
all the answer is incorrect, they either make you "too nice" (pussy who don't have an opinion) or asshole.
Why do you want to response like that in the first place ?
She's offering a piece of herself (her taste in music), and you assuming you have to reply by offering a piece of yourself (your opinion on the band). That's the wrong way to do it.
The right answer would be somewhere along the line of e) "what do you like about them"? "do you go to any of their concerts?", "what's your favorite song, album, member?"...etc
Girls don't need you to comment on their taste, they don't need you agreeing with them either. There are a thousand better responses than bringing up your negative taste, they made better conversation too.
Girl would be way more impressed if you act like you are trying to understand them, or trying to know them better instead of judging them. AND they love attention.
Rule of thumb is your opinion doesn't matter, you don't even have to bring your taste up.
Worry about how you sound, how you look, how you think all the time will only make you seem like a selfish, unconfident asshole. Or a pussy if you try to be nice at the same time.
Let them do the talking, it's easier that way.